鳥車 (Birdy) 是否過譽了？
是否像@林森 老師說的，它「在所有摺疊車品牌當中，擁有最強的綜合性能。舒適度、摺疊性、重量、路面通過性、剛性、便攜性、外觀等，全部都有，但也全部都不是最優的」。有沒有騎過的知友給個中肯的評價？
然而 其實 並不是很好騎
維基里提到如下缺點 Birdy (bicycle)（還因此違反了中立原則）：
- 價格昂貴。有的款比定製車還貴。而且單車配置奇怪到無規律可循，相對「低端」的小鹿套件卻配了個頂級車架，然後一般的架子又安了 SRAM X7 套組。 It is expensive, with some models costing as much as custom made
bikes. Component selection can sometimes seem illogical, with lower
level Capreo components on the top-of-the-line monocoque frame, and
higher quality SRAM X7 components on the less expensive model. - 輪徑小 Birdy uses less common 18-inch-diameter (460 mm) wheels instead of
the more common 20-inch wheels found on BMX bikes. This allows for a
more compact folded size but makes finding replacement wheels, tubes and
tires more difficult. - 前叉的獨特設計導致高速騎行中的平穩性差 The unique front folding mechanism is long, weaker, and more flexible
than others; the tolerance of linkages amplifies the flex, causing the
leading arms to wander; thus an old Birdy may be unstable at speed. - 座管立管偏長，騎行時間久對碗組損傷很大 The Birdy, like most folders, has a long seatpost and stem. These
components increase the weight to the bike, and the longer stem limits
the exent to which the rider can pull on the handlebars. Thousands of
miles of this activity can damage the headset or weaken the stem mount. - 後輪摺疊後鏈條無法保持上緊狀態，影響鏈條壽命，導致掉鏈 The back folding mechanism, which folds beneath the frame, doesn"t
retain chain tension (unlike, e.g. Brompton) and the chain is being
folded (unlike, e.g. Dahon in which the gears and chain area remain unfolded). This lowers the
chain lifetime, and cause the chain to derail, especially with custom
gears or harsh shipping conditions. - 摺疊過程複雜，折的時候還要抬起來，還要防止摺疊後輪時的掉鏈情況 Folding is relatively more complicated. The bicycle have to be held
high in the air while folding the front-wheel, and the axes should be
oiled frequently for the folding to be smooth. Folding the back wheel
might lead to derailed chain. All in all, folding times are longer with
the Birdy than some other folders. - 摺疊形態體積過大 The folded size is considerably larger than other same-size folders. It"s front-wheel will occupy more cubic space.
- 摺疊後沒有固定前輪和立管的設計 There"s no mechanism to secure folded stem or front wheel in folded position.
- 折起來不能立住，除非不心疼 The Birdy is not build to be parked standing in a folded position. If
tried, its front-cogwheel protector will touch the ground and might
wear considerably. - 快拆是塑料的很容易壞，稍微讓輪子離地或者載點行李都可能導致它壞掉 The plastic clip (a.k.a. "spoon") that"s used to fasten the back and
front parts is weak, and hard to find. It will wears and breaks easily
since it has to carry the back-wheel and any possible luggage: a) when
carrying the bicycle by its main part, b) by using the bicycle in such
terrains and obstacles in which the back wheel"s weight is not supported
by the ground. In such a case, the wheel and whatever luggage will be
forced down by gravity, and its total weight will be carried by the
single plastic clips, which will eventually break or unscrew itself. - 專用配件貴且難找 In addition to uncommon wheel size, the availability of some other
spare parts for the Birdy is rare, even in places in which sell folding
bicycles, due to their unique design. For example: The Birdy uses a
unique rear rack, special mud-guard, the previously mentioned "spoon",
and more.
感覺更像是老鳥的缺點。
以上新鳥的真實體驗還要煩請大神們補充。有一個小體驗：其他的自行車，騎上去之後，要踩2圈動力才會上來。但是鳥車，只要腳踏踩第一腳，車身開始就往前沖了……
很有趣，自行車也能有這樣跑車起步的力學體驗。建議大家都找台鳥試試看我說的是不是對的。
鳥車被傳得挺牛，開始還有很多問題，但是後面它真的很牛了。真正牛掰的地方是它一直在成長，30年來一直在改進——這是其他摺疊車都沒有見到的持續研發。有一些百年老店，是還在賣100年前的東西，但是有一些百年老店，是賣100年前研究出的配方，然後100年以來一直在改良的東西。製造鳥車的太平洋公司是後面這種。以下資料來自太平洋自行車的微信、官網和微博、fb等。鳥車的改進史：
1995-2004 BIRDY 第一代
獨一無二創新設計，搭配全避震、縱向折疊、主車架無折疊、優越操控性和吸睛造型…等設計。2005-2014 BIRDY 第二代BIRDY Monocoque(一體成形)主車架，最可靠的車架設計。2015 第三代 新BIRDY全面再進化(Monocoque主車架除外)，史無前例的最好
鳥3相比鳥2 改動近百處 圖示有30多處
我認為，如果要準確評價一樣東西好不好，得先看看創造它出來的人是怎麼說的。
追本溯源，如果都不知道設計者本人是怎麼想的，那就不能正確的理解它到底是為什麼被製造出來？為什麼這樣造？到底好不好？
NEW BIRDY 開發者的話
New 3rd Generation BIRDY - Designer Insights
2015.6.28 第一話
2015.June.28th Part 1
自從第一代Birdy問世至今已是20年前的事情了，這麼多年來不僅開發者不斷投入鳥車的改進，最重要的是來自世 界各地的車友提供了非常多的使用經驗與寶貴建議，成為鳥車成長改善的原動能，在此首先對廣大的鳥車友們致以最高敬意。
A full twenty years following the BIRDY』s introduction to the market, our design team has been continuously devoted to improving the bike, motivated not only by a sense of perfectionism, but more importantly by global BIRDY fans』 experiences and feedback. Before going into our main subject, we would first like to express our deepest appreciation and gratefulness to all the great BIRDY fans out there!
承襲過去20年的慣例，鳥車每10年改款一次。2014年起，開發團隊就積極著手第三代鳥車的設計，這次我們要為大家帶來什麼呢？這個議題非常艱難，一台經過20年淬鍊下的產品，在持續改善下幾乎已達完美，如果不能帶來革命性的改變，往往會流於為改變而改變而顯得多此一舉，所以此次改變有兩個大主軸，一、 是在鳥車中植入新的DNA，二、挑戰摺疊尺寸的極限。
Following a tradition of only implementing major model changes every 10 years, our design team launched the 3rd generation BIRDY development project in 2014. The first challenge we faced was 「what can we bring to the market?」. Quite a task for a bike that has received universal approval spanning 100,000 fans and 20 years. We wanted to implement actual evolutional improvements that served a purpose, not unnecessary 『design for design』s sake』. With this in mind, we settled on two major design goals: First, new 『DNA infusion』. Second, the smallest folded size possible.
乍看之下這兩件事好像很容易，但在摺疊車市場上卻是空前未有的創舉，絕大多數的品牌以推出新的產品來做為反應創新的成果，但在太平洋認為推出新產品不等於創新，而是站在既有的基礎上向上提升，使消費者對此產品有全新的感受，這才是開發者想挑戰的另一個層次。
In theory, these two goals seemed relatively easy. However, both were actually something that have never been successfully achieved in the folding bike industry. While many brands consider 「innovation」 to simply mean 「introducing new products」, Pacific Cycles believes it is about more than just having something new. We believe innovation is to transcend from the current foundation, and bring a new level of enjoyment to our users.
九零年代中期開發的鳥車，是以當時最為火紅的山地車幾何尺寸作為基礎的設計，第三代鳥車這次修改中特別加入低重心設計，騎乘者可明顯感受到新車在過彎、抽車、給力...等方面有明顯提升，這點賦予了鳥車全新的生命，也可以再一次發現開發團隊的功力。在摺疊尺寸方面，更是空前絕後的改變，在原有的基礎上一方面提升整體車架剛性，另一方面又將摺疊尺寸縮小約百分之十五，這點應該在其他摺疊車品牌中前所未有的。
The first BIRDY design of the mid 90』s was based on mountain bike geometry, which at the time was the preferred format. However, the NEW BIRDY features a lower center of mass, allowing cyclists to enjoy benefits such as vastly improved cornering, powering-pedaling out of the saddle, increased output efficiency, etc. These exciting new capabilities once again showcase our team』s keen design skills and willingness to listen to its customers. Another outstanding improvement is the reduced folded size, which allows the NEW BIRDY to fold a full 15% smaller whilst being much more rigid than the original structurally!
2015.6.29 第二話
2015.June.29th Part 2
承襲上述兩大主軸，接下來為各位做細部的解說：
Following Part 1 subjects, I would like to address the details in Part 2
我們就從第一點植入新的DNA開始，一部自行車與人接觸只有三個位置～踏板、座墊、握把，重心的下降意味著這三位置必須做適切的調整，何謂適切的調整就是功力的所在，如果您也企圖自己動手設計一部自行車，那你必然了解到所謂牽一髮而動全身的道理，因此我們了解到鳥車無論是立管、前叉、車架、後旋臂都必須做一定調整才能符合設計團隊新的要求。
Let』s begin with the new DNA. With pedals, saddle, and handlebar being the three contact points between cyclist and bike, it was critical we made sure these points were optimally positioned in relation to the bike』s new lower center of mass. Bike designers know very well that 「a small change affects everything」, so for our new DNA design to function successfully, precise positioning of the NEW BIRDY』s stem, front fork, frame and rear swing arm were of vital importance.
在幾何尺寸調整過後，下一個重要課題就是如何讓摺疊的體積變小，在此我必須強調我們並不打算改變原來摺疊的步驟，同時也沒有打算捨棄原有設定好的剛性提升，故我們只能在生產工法上找尋正確的答案，大量採用先進生產技術例如3D鍛造、液壓成型等工法，使得立管、前叉、後旋臂在強度、精準度、耐用度與尺寸大小間得到一個完美的平衡，我們堅信我們的努力為摺疊車世界建立了一個全新的里程碑，雖不敢說後無來者，但絕對是前無古人。
Following this geometry adjustment, our next issue was how to reduce folded size. As we didn"t want to modify BIRDY』s original folding method or compromise frame rigidity, we began to explore new manufacturing approaches that would make this possible. The application of state of the art production techniques such as 3D forging and hydroforming to make the new stem, front fork and rear swing arm—resulted in increased rigidity, precision and durability. More importantly, fold size was significantly reduced! We believe this accomplishment has set a new milestone for folding bikes.
接著我將從車手立管開始向各位解釋每一項細部工程改善內容。
Next, I would like to share with you the details of the engineering improvements of the new stem.
車手立管，一部自行車最重要且最危險的機構設計就是車手立管，一旦立管在騎乘中發生故障或斷裂，往往造成的是不可磨滅的重傷甚至死亡。另外因材料厚薄差異導致焊接後熱脹冷縮變形，導致摺疊機構摺疊時無法完全切合的問題。故在綜合考慮情形之下我們才用了最新的3D鍛造技術，更為了確保質量的穩定性，故鳥車立管上中下三部分皆為3D鍛造，後CNC自動加工，並提供多角度配置，提供座艙距離多重選擇。
The stem is one of the most important components on a bicycle. It is also potentially dangerous, as, if broken or malfunctioning, can have devastating consequences to the rider. Taking such factors as material quality, thickness tolerance, deformation after welding, etc. into consideration, we applied 3D forging in making the NEW BIRDY stem, separating the forging process into upper, middle, and bottom parts. These three different parts were then all CNC machined to ensure stability and consistency. This unique new stem design offers cyclists a wider range of different angles and cockpit reach options.
再者為因應廣大車友喜歡將鳥車當作類山地車使用，我們也將車手由25.4mm調整為31.8mm外徑，並將螺絲由兩顆改為四顆以提升爬坡時車體剛性。
We also increased the handlebar diameter from 25.4mm to 31.8mm, and used four screws instead of two in the handlebar clamp. This dramatically enhances the bike』s steering rigidity, especially when climbing hills.
在發表了兩篇開發者的話之後，有些讀者反應希望能更深入了解其中的涵義，所以在此做更詳盡的說明。所謂的低重心在車架設計中我們特指的是五通中心至地面的距離，英文通稱BB DROP，簡單的來說一般山地車五通至地面距離約為300mm，越劇烈比賽用的山地車如下坡賽專有往往會高過320mm，換言之當五通高度離地面小於300mm，就是我們所謂的低重心設計，一般公路車大約在270mm毫至290mm之間為通用設計，所以當然也有超低設計低於260mm，但並非越低越好， 因為同時必須考慮與曲柄長度配合，目前歐盟遂行規定自行車傾斜時須保有至少二十五度傾斜角，在此狀況下腳踏板最低點不得與地面接觸，因此在決定五通高度時需要考慮包含五通中天心長度、五通高度、曲柄長度等因素，並需要互相配合與協調才能發揮騎乘時之最大效能。最新版鳥3五通高度離地為279mm，實屬低重心之設計，故能提供類似公路車的安定感與抽車時給力較為直接的反應。
After releasing Parts 1 and 2, we received much feedback asking for further technical details. I will address more of these in the following paragraphs (Parts).
In Parts 1 and 2, I talked about lowered center of mass (or BB drop) which specifically means the distance between the center point of the BB to the ground surface (BB height) is shorter. In general, mountain bike BB height is designed around 300mm. Downhill mountain bike BB height is usually designed over 320mm. In other words, when the BB height is shorter than 300mm, the bike will be considered a lowered mass center design. Generally, the BB height of road racing bikes is between 270mm to 290mm. Although we have also seen extremely low mass center designs of 260mm BB height, lower isn"t necessarily better because we also need to consider the crank』s length. According to EU standards, bicycles must maintain at least a 25 degree angle when tilting. Therefore, when deciding BB height designers must seek the perfect relationship between BB height and crank length to bring out the bike』s maximum efficacy. With a BB height of 279mm, the NEW BIRDY is classed as a lowered mass center design, offering increased stability and responsive feedback similar to road racing bikes.
2015.6.30 第三話
2015.June.30th Part 3
介紹完車手立管的全新設計之後，我們接著把重點移至鳥車下一個重要的設計變更～前叉，從1995年起鳥車上市以來他特有的前叉設計就一直是鳥車的一個重要特徵，結合了避震與摺疊的雙重功能提供騎士於顛坡路面最佳的貼地性與舒適性，同時又可以兼顧重量與摺疊功能的考慮，這樣一支完美的前叉設計又要如何提升呢？實際上二十年來在廣大的車友測試之下我們接受到不同的反饋，其中包含站立抽車時前叉偏軟、碟煞版重度使用後微量變形導致碟盤觸碰來令片、下坡時前叉過度靈敏、摺疊時與不同規格後變速器產生摺疊後尺寸大小有所差異...等問題，上述所有問題我們設計團隊在這次全新設計的鳥車前叉里都已考慮並ㄧㄧ提出解決方案。
Let』s talk about the next design change, the front fork. Since BIRDY』s introduction back in 1995, the front fork has always been the bike』s iconic symbol. It cleverly integrates suspension and folding functions into a single design, providing outstanding comfort and ground tactility, with light weight and ease of folding. How could we improve upon this apparently perfect design? In the twenty years since launching, we have gathered several important improvement directions from the market. These include reinforcing fork rigidity under intensive cycling, eliminating deformation due to heavy disc brake usage, improving downhill steering sensitivity, and difference in folded size caused by different components, etc. All of the above-mentioned have been thoroughly considered and solved, one by one, by our design team.
接下來由我為你說明，首先我們先將鳥車前叉分成兩大部分，我們通稱I型前叉與L型前叉，透過避震轉點與彈簧將鳥車I型前叉與L型前叉結合在一起。再來從I型前叉介紹起，為了提升前叉整體剛性，在新款鳥車中我們將I型前叉傳統的方管改為菱形管，這項改變強化了縱向與側向的剛性，但也同時提升了彎管的難度，另外藉由車架頭管角度配合五通降低之後做微量的調整，提升了整體操控的安定性與下坡時的穩定度，如果有機會將二代鳥車與三代鳥車作同時的上、下坡騎乘比較，您將明顯的發現前叉彈簧在二代鳥車有明顯的作動，但三代鳥車前叉彈簧相對安定許多。
The BIRDY front fork consists of two parts, an 「I-shape」 and an 「L-shape」, which are connected by a suspension spring. To reinforce the rigidity of the I-shaped fork we applied hydroforming techniques to change its original rectangular shape into a diamond shape. Although this posed production challenges, the end result was significantly reinforced vertical and horizontal rigidity. In addition, by adjusting the head tube angle and BB height the NEW BIRDY now has much more stable maneuverability, which is easily demonstrated by comparing the suspension spring』s movement on the new model with the 2nd generation BIRDY.
關於L型前叉的設計就更為創新了，一直以來L型前叉是鳥車生產上最困難的一部分，乍看之下簡單的L型前叉實際上是由10件不同的材料焊接而成，焊接過程中產生的變形量一直以來是我們致力克服的問題，我們常戲稱加熱冷卻後產生的變形是上帝偉大的設計之一，作為人類的我們實在難以對抗上帝的設計，在全新的三代鳥車中我們大膽的嘗試了液壓成型的工法，配合全新設計的鍛造前爪，我們將10件不同的材料縮減為3件材料的焊接，大幅提升焊接後的準確度，從側面看去L型前叉的造型好像沒有太大的改變，但詳細的看來L型前叉整體寬度由100mm縮減為74mm，這項設計大幅改善摺疊後的尺寸，另外因為採用也是剎車不對稱性設計將碟盤位置維持原有的一100mm寬度（上述所有尺寸皆為中心線寬度）。
For the 「L-shaped」 section of the front fork, the design changes were significantly more impressive and innovative. As this L-shaped part of the fork was previously formed by welding together ten different individual parts, it posed our biggest manufacturing challenge for a very long time. However, for the NEW BIRDY we managed to reduce this to only three welded parts, allowing us to provide a highly precise fork with almost no deformation problems. This was achieved using hydroforming techniques combined with a newly designed forged dropout.
Appearance-wise, there isn』t much difference between the old and new L-shape front fork, but upon closer inspection we can see the new one has a narrower width (from 100mm to 74mm) with an asymmetric design that allows the disc brake to fit nicely.
接下來我想利用一點時間解釋L型前叉液壓成型的工法，一般液壓成型工法在自行車上已被廣泛運用，一方面可提升結構強度另一方面又可達到多樣化的外型，但在L型前叉上設計團隊運用了極大的巧思，誠如各位可以理解到方形管的物理特性，要將方型管彎曲成現有L型前叉的造型並同時產生一個平面來固定前叉彈簧的位置，基本上是不可能的，因此設計團隊大膽採用橢圓形管作為彎管的母管，再採用液壓成型的技術將橢圓管成型為方管並同時產生固定彈簧的斜面。另外還值得一提的是新的前叉鍛造前爪，在二代鳥車中的碟煞前叉我們採用了平板的前叉結構，雖然已經採用7mm厚鋁板但仍無法有效避免重度使用後前叉微幅變形導致碟盤觸控來令片的問題，這次全新設計的前爪採用T型結構，徹底加強了縱向與側向剛性，解決二代鳥車碟煞前叉的小小缺憾。
Next I would like to spend some time outlining the details of the hydroformed L-shape front fork. Although hydroforming techniques have been widely adopted among in the industry due to advanced shaping and structural reinforcement advantages, with the NEW BIRDY our design team has taken it to the next level! To be specific, we originally used oval shaped tubes for bending, which we then hydroformed into diamond shapes. Next we created a flat surface space for suspension positioning (this could not be achieved by bending rectangular tubes due to physical limitations). New forged dropouts are another unique front fork design feature. By redesigning the dropouts (from 7mm aluminium plate) to a T-shape structure we have significantly increased overall rigidity, and eliminated any deformation problems caused by heavy usage.
下一回我將仔細解說第三代鳥車的另一個重要改變後旋臂設計，敬請期待。
Next, let』s dive into the details of BIRDY』s new rear swingarm design.
2015.7.2 第四話
2015.July.2nd Part 4
鳥車第三代後旋臂如同前叉一般有全新的設計，有別於一般市售摺疊車採用側向摺疊設計，鳥車一向以來採用懸吊式避震系統與縱向摺疊的整合設計，這點也是鳥車二十年來一直為人津津樂道的特色之一，我們認為摺疊設計的最高境界就是化摺疊的機構於無形，這樣就永遠不會有摺疊器鬆動或故障的問題，巧妙地結合懸吊避震轉點同時作為摺疊機構的轉點，是鳥車1995年推出以來一直成為眾多摺疊車進階玩家的唯一選擇，不論一般都會、城市悠遊或爬山攻頂的劇烈操作都輕鬆自在、且使命必達。
Unlike conventional folding bikes which use a horizontal folding method, BIRDY adopts a special vertical design folding method. This clever design integrates the suspension system with the folding mechanism; and has been one of the key factors in BIRDYs success and popularity throughout the years. We believe a perfect folding design avoids folding hinges because these can easily create malfunction or play problems. Designed to use one shared pivot for suspension and folding, BIRDY has become the perfect small-wheeled folding all-rounder for urban, trekking and even intensive cycling.
第三代後旋臂的設計考量到摺疊後整體尺寸的大小，以及展開之後與前三角整體造型互相輝映，不論在美學及功能上都有卓越的提升。首先吸引眾人目光的是位於後旋臂外側液壓成型的一道凹槽，這道凹槽的外型與前三角互相輝映一氣而成，同時亦能提升後旋臂剛性，為了達成最初設定的縮小15%摺疊尺寸，這道凹槽與上視角幾何尺寸調整扮演了重要的角色，二代鳥車後旋臂略為外八的造型在三代鳥車上看來幾乎平行，為配合上述幾何角度調整就必須連同後旋臂前端轉軸V型束子與後爪造型都有全新的設計，另外值得一提的是這次設計團隊採用半隱藏式焊接，將外露的焊道降至最少，鳥車後旋臂造型更加整體化。
When designing the new swingarm our main focus was to achieve the smallest possible folded size, while maintaining a consistent and streamlined appearance that would match the frame. In short our goal was to build a better new swingarm, both in appearance and function.
The first thing you will notice is the beautiful new concave contouring. This streamlining is not just for aesthetics, it actually dramatically increases the swingarm』s rigidity. We also applied semi-concealed welding to keep the joint as visually clean as possible, and provided a totally integrated swingarm. Furthermore, we also narrowed the swingarm』s width and redesigned its dropout and pivot V-stay. As a result the NEW BIRDY folds 15% smaller than before.
設計團隊這次特別運用液壓成型靈活的特性，使後旋臂管前端縱向加高、後端橫向加寬的成型工法也是其中一項特色，這些如髮絲般的細節設計都是舊有的生產方式無法輕易達成的，加上新的煞車線與變速線走線安排與導管的巧思也解決了展開鳥車時導致變速線外管容易受傷的小小的遺憾，這個簡單既聰明的作法同時也適用於二代與經典款鳥車上。
During the development of the NEW BIRDY, we leveraged hydroforming』s greatest advantage—flexibility of material forming—to increase the swingarm』s vertical height and horizontal width, something that would have been impossible to achieve using original manufacture techniques. Also, we internalized all cable routing and added metal tubing for cable guidance (also available for 2nd generation BIRDY/Classic BIRDY models). These two clever improvements prevent cable tangle and scratching problems when folding and unfolding the bike.
為了克服市售各式各樣後變速器的些微差異，我們也全新設計了新的後變速器掛勾，新的後變速器掛勾以逆時針方向向前旋轉約10度，這項改變使後變速器在摺疊後的位置與前輪花鼓中軸產生錯位，避免碰撞並達到縮減摺疊尺寸。再來2014年新上市的鏈條拉緊器在今年的三代鳥車中也成為標準配備，這麼多林林總總的改善可以顯見設計團隊在後旋臂上頭注入的心血。
Our design team also overcame the important issue of different component sets resulting in varying folded sizes. By redesigning and repositioning the rear dropout slightly, we gained additional space between the rear derailleur and front hub after folding, preventing the two parts colliding and thus creating a smaller folded size. Also, the chain tensioner—previously an optional accessory—has now become standard spec, providing smoother folding and unfolding.
http://www.pacific-cycles.com/ (二維碼自動識別)
到此為止我已將第三代鳥車主要設計方向做了一番解釋，其餘細節更希望讓車友在上市後慢慢地發覺與探索，我們相信三代鳥車是有史以來考慮最周延、設計最完善的一部摺疊車，更希望車友接下來到各地經銷商細細品味、比較與試乘，謝謝！
Overall we have made almost 100 improvements to this new model and we strongly believe the 3rd generation BIRDY is the most mature and well-designed folding bike. We welcome enthusiastic cyclists who are interested in the NEW BIRDY to visit their nearest authorized distributors and dealers to review, test ride and compare the NEW BIRDY—and find out for themselves what makes it so attractive!
-------------------------------------------------------最後 樓主的問題：——「在所有摺疊車品牌當中，擁有最強的綜合性能。舒適度、摺疊性、重量、路面通過性、剛性、便攜性、外觀等，全部都有，但也全部都不是最優的」
下圖是太平洋自行車在2016年上海自行車展台 指示的BIRDY特性，看起來就是：
舒適度90分、速度85分、摺疊尺寸70分、摺疊難易度75分、重量80分。
太平洋自行車用這個圖表給了樓主回答:萬金油，每項都不是滿分專長。但是想要選擇一個全能型優勢最均衡的，還得是birdy。
從sp8開始一路aaa083，小布，birdy，目前期待tikit，現在每天30公里的騎行感覺下來還是小布更符合我上下班的需求，輕快，方便摺疊，姿勢優美，birdy折完總有一坨的感覺。
騎車從上地去了一趟鳳凰嶺，沒把我累死，從此之後北京再也沒騎行過。
1.別人都是山地車，兩三千塊那種吧，個別的萬把塊，明顯比這個車好騎；這車騎著太累了，可以校園和奧體周邊溜溜彎去超市買菜可以。
2.去鳳凰嶺的路況比較差，路上螺絲鬆了車蹬掉了，╮(╯▽╰)╭哎
幸好有個師兄專業的，隨車帶著維修工具包，不然我得扛回去。
3.逼格高，折一下裝袋子里過地鐵毫無違和感。
4.車子是我老領導的，上次見它是被仍在辦公室門口，土了吧唧的╮(╯▽╰)╭哎。
Birdy3車主。是有點過譽了。從商業方面說，這個車造型特別，製造複雜，銷量小，這個價格還算合理。但從實際使用上來說，它比普通摺疊車的優點是，騎行姿態舒展，稍微更順暢靈活一些。缺點是兼容性很不好，到處是定製化的零件，無阻尼的減震設計更多是為了緩衝車架收到的衝擊，對騎車人意義不大。摺疊時會彎折線管，有可能影響指撥放線的流暢。摺疊時的動作也比較大。 birdy不是一個單純的運動型自行車，它的價值包含了時尚外形帶來的大量溢價。如果你已經有一輛用心改裝過的普通摺疊車，那麼花1W多才能買到的birdy大概不會讓你滿意它的騎乘感受。
今天騎著我的小布去海邊兜風。半路上停下來拍個照，裝個逼。然後一輛銀色鳥車從身邊慢悠悠的騎過去。我整個人一下子不知道怎麼就不好了。
說鳥車不好騎的有鳥車嗎？比小布好騎多了好吧，不過確實需要大改
品牌影響力已經文化號召力（大霧），然後就是優點比它突出的車的缺點也比它突出（或者沒有了鳥的擁有的一些特性），好聽些就是綜合實力不錯。
很多被外型吸引，只要夠拉風，不輕易掉價就好騎。也是種情懷了現在，即使不是很好騎也能忍
如果你喜歡，那就是好。 現在價格都很實在，70%了。 [圖片未上傳成功]
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