或者等我呢個google王搭下咀
其實我研究不多，我只在google search "bike weight under 10 lb"
發覺是有的。
不過，發言者說：
source: http://newsgroups.derkeiler.com/ ... 05-10/msg00530.html
Hopefullly I can answer some of the questions you
have.I am the person that spec'd and built the 8lbs Ghisallo,
although now it's closer to 7.75lbs.
The bike is not only rideable, but gets ridden on average about once a
month.Obviously the bike is not built for a big rider or a sprinter.
The ride uphill is unbelieveable.The ride down hill is ok, unless the
speeds get over 20mph, then it becomes a little scary.The wheels are
so light and narrow that they do not have a good gyroscopic effect and
that makes the bike feel sketchy at 20+mph.
I have built many bikes in the 10-12lbs range, and all of those were
daily riders and quite dependable.
source: http://www.twowheelblogs.com/worlds-lightest-road-bike
我覺得佢主要意思是：10lb以下不是不可能，也是「rideable」，只是在衝刺、高速下都很「scary」，而且為了偷輕，用很幼很幼的車輪，反而不利高速行車。即是：
「輕，可以，但不一定好」
source: http://newsgroups.derkeiler.com/Archive/Rec/rec.bicycles.racing/2005-10/msg00530.html
There are two basic groups of riders to whom this is important.
The first is the serious athlete. A few seconds advantage is not something he can give up. No matter what the quality of the ride of the bike in question, he must seek every attainable performance gain in his equipment or his body.
Then there is the large body of dedicated cyclists who enjoy the sport at various levels, but do not compete in the higher racing categories. I think this is almost everyone reading this essay. For these riders, the choice of bike and equipment should involve a more complex, qualitative study. Weight is one consideration. But there are others. How does the bike feel? Is it stable? Does it fit? Does it have the snappy, clean, vibrant feel that should be the soul of a great bike?
These basically sensuous questions that are beyond simple quantification. It's not a matter of a 73 degree head tube or 18 pounds or 9 sprockets in the rear. It is the whole bike, taken as a whole that must be considered. One should not pick a bike as if he were one of the 7 blind men describing the elephant.
The fact that these 1.5 - 2 pounds are so unimportant in choosing a bike should be looked upon a truly liberating. Now we can to back to judging bikes on their real merits.
Before leaving this discussion, let's look at the most common "upgrade".
A full carbon fork is considered an upgrade that will add greatly to the competitive advantage of the bike. A full carbon fork replacing a steel fork can take off a little less than a pound. Remember, that's our 6 seconds. Clearly, we have all been oversold on the carbon fork as the easy performance upgrade. There is some improvement, but it is minuscule. And it is not without its costs in quality of road feel. For more about carbon, please see my essay on materials.
Or in other words, Scarpelli, you can't buy a bike light enough to keep up me with on a climb.
最輕roadbike，6lb幾
6lb Road Bike – World’s New Lightest Bicycle from Fairwheel Bikes! posted by Tyler (Editor) - September 29, 2010 - 4pm EDT
http://bicycledesign.net/wp-content/uploads/2010/09/1035_Worlds_Lightest_Bike_9.jpg
If you want the world’s lightest production road bike, click here. If you want what appears to be the world’s absolutely lightest bike, read on.
Hiding somewhere in the back of Interbike’s halls was this 6lb road bike. The bad news is time conspired against us in actually getting to see it and put it on our scale. The good news is, TriRig and Velonews have some photos and specs, which we’re happy to list here.
First up, you may have seen this frame before. It’s the same frame and fork that’s shown up in Internet lore when built and owned by German Cyclist Gunter Mai, at which time it weighed in at a still unworldly 6.55-ish pounds. Well, Gunter broke it down and sold the parts online, and according to Bicycle Design, the custom Spin frame and THM fork went to a Colorado rider who then sent it to Fairwheel Bikes, which brought it down to six pounds even (2,700g)!!!
A big part of the diet is thanks to some prototype-but-sort-of-going-into-production parts from Dash Cycles, which are insanely light.ÂCheck out links and parts lists with a few photos after the break…
http://www.bikerumor.com/wp-content/uploads/2010/09/fairwheel-bikes-spin-custom-lightweight-carbon-road-bike-frame-600x354.jpg
First off, let’s start by listing the things you won’t be able to do to get your “stock” bike this light:[*]Integrate the downtube shifters into the frame at the headtube…heck this whole frame for that matter, although Cervelo’s Project California gets you pretty close.[*]Get the rear hub (but you can get something close)[*]Get the rims because they’re made from leftover Formula One carbon fiber material that’s basically unobtanium[*]The fork is a complete one-off custom, and the integration of the fork to the frame would make it difficult to mimic the headset configuration[*]A lot of parts are one-off customs, which you could get similar if you have very, very deep pockets. The estimated cost to recreate something like this bike is more than $45,000.
From there, a lot of the stuff on this bike is either available or modifiable.http://www.bikerumor.com/wp-content/uploads/2010/09/dash-cycles-full-carbon-front-hub-290x170.jpg http://www.bikerumor.com/wp-content/uploads/2010/09/dash-cycles-full-carbon-rear-hub-290x169.jpgHailing from Boulder, CO, Dash Cycles has been building composite items for various industries for years. Being avid cyclists, they finally turned their attention to two wheeled items and created some hubs and saddles. While the rims used on this bike are completely custom and one-off from AX Lightness, the hubs are very similar to these production versions that you can buy for $1,000 per set (or $350 front, $750 rear). Production versions (shown here) weigh in at an unbelievably light 30g (F) and 99g (R) with Enduro ceramic bearings. This bike, however, gets a pre-production prototype rear hub that weighs just 84g!http://www.bikerumor.com/wp-content/uploads/2010/09/dash-cycles-ax-lightness-pillar-bicycle-wheelset-600x561.jpgThe result is a 583g wheelset. Word on the street is Dash Cycles is developing both tubular and clincher carbon rims, so you may be able to do something similar to this wheelset in the future.http://www.tririg.com/articles/1035_Worlds_Lightest_Bike/650/1035_Worlds_Lightest_Bike_13.jpgIn addition to the frame, Fairwheel kept several of the components from the original Gunter build, including the seatpost/saddle combo and the stem, handlebar and brake levers.http://www.tririg.com/articles/1035_Worlds_Lightest_Bike/650/1035_Worlds_Lightest_Bike_3.jpgOddly enough, from here Fairwheel actually had to increase the weight of several components from what Gunter had put together in order to make the bike better handle descents and “normal” riding (although Gunter claimed to ride the bike daily in its sub-7lb form). For example, they wanted a full range of gears rather than the 6 speeds Gunter had on the rear, and the brakes needed more power.For example, the modified Red derailleur above comes in just over 100g, but that’s a full 59g heavier than the custom Huret/BTP rear derailleur Gunter had.ÂAdd in a 10-speed Red cassette and you start talking about 3% to 5% of the entire bike’s weight. The derailleur pulleys are totally minimal carbon units (not sure who from…nor the chain, but we’re looking into it).http://www.bikerumor.com/wp-content/uploads/2010/09/fairwheel-bikes-myth-rico-de-wert-crankset-600x412.jpgTo further combat gram creep, Fairwheel used a prototype crankset from Myth’s Rico de Wert that weighs in at an astoundingly light 281.4g with bottom bracket bearings! These saved about 16.6g over the THM Clavicula crankset on Gunter’s build. They look an awful lot like Craig Edwards/eeCycles’ new Sweetwings…The carbon gear rings aren’t an entirely new concept, we showed you some from Newbury Park Bike Shop in NJ in April, but these are from another manufacturer (still trying to find out).Fairwheel also saved some grams with the headset, helping them achieve the almost unbelievable weight of just 6 pounds for a completely functional, actually ridden road bike.SPEC LIST:Full Spec List with links and weights when we could find them. We’ll fill in the holes as we find more info (Thanks to the readers for helping us fill in some holes…we’ll keep updating):[*]FRAME: Custom SPIN carbon frame (643g)[*]FORK: One-off custom THM Scapula SP Tuned(185.9g)[*]HANDLEBAR: Schmolke custom TLO (111g)[*]STEM: NoRa CfK by Oliver Grest (54g)[*]SHIFTERS: Carbon downtube shifters by BTP (9.2g)[*]REAR DERAILLEUR: modified SRAM Red (~102g)[*]FRONT DERAILLEUR: modified Campagnolo Record (49.9g)[*]CRANKSET/BB: Myth prototype including bearings by Rico de Wert (281.4g)[*]CHAINRINGS: Fibre-Lyte (39T 29g / 53T 43g)[*]CHAIN:[*]BRAKE LEVERS: modified Campy Ergo shifter levers to remove shifter parts[*]BRAKES: AX Lightness Orion Premium w/ BTP race pads and cordz adapters (103.5g)[*]SEATPOST COLLAR: BTP (2.9g)[*]SEATPOST/SADDLE: custom one-piece Schmolke TLO/Tune Speedneedle combo (75g)[*]HUBS: Dash Cycles Monique (F) and Rachelle (R) (129g)[*]RIMS: custom AX Lightness[*]SPOKES: Pillar titanium[*]PEDALS: custom Aerolite, then drilled out (<76g)[*]CABLES/HOUSING:[*]OTHER: Foam rubber grip tape[*]HEADSET: Mostly custom, Extralite and KCNC Morion, but see Fairwheel link below for explanation (18.9g)EXTERNAL LINKS:If you feel like tumbling down the rabbit hole and wasting the rest of your day, here are the links that helped us put this story together:Fairwheel Bikes has a pretty extensive run down of how they built this bike up, what they modified and basically a good story to tell. Check it out here. Oh, and they mention how they’re going to make it even lighter, and by the time this bike hit Interbike, there were already some changes versus what’s on their blog.You can find the original build from Gunter Mai here.VeloNews has a photo gallery from Interbike here.TriRig borrowed the bike and took a lot of photos here.
另外，Lance Armstrong 原來架車係 14.96 lb (6.8 kg)
根據呢個post，比賽車係有下限的：http://ask.metafilter.com/60425/Lightest-racing-bicycle
The lightest bike Lance Armstrong would race with would be 6.8kg, because that's the lightest weight allowed by the UCI (the international governing body for cycling).
Much lighter bikes are attainable. The Litespeed Ghisallo (drool) mentioned by unSane is easily obtainable if you've got the cash.
The 6.8kg limit is a pretty arbitrary number imposed to keep the playing field level and to prevent bike manufactures from producing bikes that are "stupid light" (that is, to use so little material in the frame and components as to constitute a safety hazard).
There's a lot of cyclists calling to lower the UCI weight limit, as it's clearly possible to make a very safe 9lb bike.
hongdonald兄架車可能因為係比賽車，所以係14 lb 幾，其實要輕係可以的。
本帖最後由 hongdonald 於 21-5-2011 09:31 PM 編輯
低過10LBS?點砌(用市面買到既件)?
小弟部S-WORKS 14.63 LBS已經好輕下,12磅都仲有機會,9磅幾真係真心求教.. ...
hongdonald 發表於 20-5-2011 03:42 PM http://photomarket.hk/images/common/back.gif
Re Kay:
我都再重申一次係用市面買到既件..其實你唔使下下句句頂到衡我亦無意思同你嘈,乖乖地好嗎?
以呢部未安裝PEDAL/水架/測速組件/頭尾燈/車袋(小弟既單車係係有哂呢D配件既情況下量度,呢度大約多多800G到)既極輕既車架R5CA都要11 LBS(UCI既最低車重為6.8KG折合14.96LBS)，如果有單車舖有一部10LBS以下既單車賣，你都要認真考慮下呢部單車既安全性。
至於踩唔踩得起呢個問題，老實講唔關我事，我只係鐘意踩單車,肯投資落去令我部車更好踩。
http://www.bullbike.net/forum/vi ... 7169&extra=page%3D1
而外國亦有不少網站係講極輕重量既單車,不過好多部都係為左做數據而未必踩得(留意下好多PARTS都係MODIFIED)。
http://www.light-bikes.com/BikeGallery/BikeSelect.asp?catid=3
另外你個標題同內文都係用XXXXXX來代表你朋友既成車，我又點知你朋友部單車既牌子呢?
講番HIGH PROFILE RIM既問題，理論上(唔計路面情況同風阻)，一對1500G既HIGH PROFILE RIM同LOW PROFILE RIM既LINEAR MOMENTUM應為一樣，但LOW PROFILE RIM係有風阻既情況下，會對空氣流動產生吸力轉為阻力(風打係外圈時力度不平均，所以係大風既情況下單車手要作出修正平衡)，而HIGH PROFILE RIM都一樣係靠住空氣流動產生吸力(受力比較平均),車手無需用太多力量作出平衡亦可專心將力量放係PEDAL上。但我亦同意High Profile Rim係燈位起車比一般軨困難。
除左PROFILE既高低，框同軨枝既結構濾(放射結構同三方集中結構等)都好緊要。
我亦都唔係D咩 PHYSICS 專家，只係將有限既知識分享出來，只知道小弟用緊既兩對CARBON軨(28MM上山小刀鈴,約9XX G重,呢對李兄都踩過，Zipp 303 46MM中刀鈴,約1171G 重。)都比小弟以前踩過既鋁軨好踩，亦樂於推介比車友。
禮!
http://i100.photobucket.com/albums/m35/hongdonald/b3faa67a.jpg
本帖最後由 hongdonald 於 21-5-2011 08:48 PM 編輯
另外，Lance Armstrong 原來架車係 14.96 lb (6.8 kg)
根據呢個post，比賽車係有下限的：
hongdonald兄 ...
Homan 發表於 21-5-2011 07:59 PM http://photomarket.hk/images/common/back.gif
正解,一般UCI既比賽，車重要係6.8KG以上，由於好多車手都係踩緊由廠方CUSTOM MADE既車架,基本上部部都係6.8KG
呢個網站會拎車手D 實車來分析，基本上佢地由車架/軨/配件都係CUSTOM MADE,無可能係市面上買到。
http://www.bikeradar.com/road/ne ... ies-cervlo-s3-30259
係度OT少少,分一對軨既好同壞(以小弟踩出來既感覺)，除左PROFILE高低同重量，剛性都係一個好重要既考慮因素。
根據ACTION AND REACTION FORCE既NEWTON'S LAW同槓捍原理
係搖車時，地面反映番比車架既力量係好緊要，假如剛性不足，力量比地面吸收太多而轉性熱能/聲能，咁成個EFFICIENCY都會減低。
當然，車架/傳動套件同配件都有一定既因素。
個人認為，想部單車好踩,首先要考慮既應為:
1.車架
2.輪組
3.傳動套件(KAY兄你之前提及DA件比其他低級件如105/TIAGRA等分別只係重量，我唔認同，因為我自己都用過TIAGRA,剩係轉波時間同反應都差好遠)。
希望此POST作理性討論，成40歲人，咪咁認真同細路鬥氣...
回復c_Foo
真係有錢，我買起佢間店再炒左果個員工
Homan 發表於 19-5-2011 04:49 PM http://photomarket.hk/images/common/back.gif
狗眼人果位係老闆，叫歐陽良，係60~70年代活躍香港既單車手。
我自己就上過去運吉同買鞋，又覺得無咩，仲同佢吹兩咀傾意大利車架..
嘩～ 我又OT，HONG兄有「上刀山」鈴，咁有無「落油鑊」鈴？{:2_138:}
希望此POST作理性討論，成40歲人，咪咁認真同細路鬥氣...
hongdonald 發表於 21-5-2011 08:47 PM http://www.photomarket.hk/images/common/back.gif
我冇同你鬥氣，我只係覆咗你一個 post，叫你問問題前先睇番我 post #1，因為你問嘅嘢我響第一個 post 已經有講，你睇咗先問好唔好？
第二，我同事㗎車的確係得 10 lb 以下，而且響一般單車鋪買 (我已經話咗響新界區)，而 10 lb 樓下嘅單車響上水咖及旺角某 d 單車鋪前排都有 display，都係標價八萬幾。
第二，16 lb 嘅 MT bike 亦真係響返大陸團出現，所以假如一架硬架 MT bike 可以做到 16 lb， road bike 有 14.73 lb 一 d 唔值得奇怪。(至少少一條避震 + 用簿呔已經輕好多)
希望你當尊重吓我，先睇咗我嘅 post，然後先問人，都如果你問嘅嘢我冇講過，我識的話一定會答。如果我講咗，你又問，咁究竟係邊個唔理性呢？
狗眼人果位係老闆，叫歐陽良，係60~70年代活躍香港既單車手。
我自己就上過去運吉同買鞋，又覺得無咩，仲 ...
hongdonald 發表於 21-5-2011 09:37 PM http://www.photomarket.hk/images/common/back.gif
一位做人做生意都冇品嘅單車手，大家千祈唔好學。
回復 30# egg_studio
大家都咪問了。有咩PM解決…
咁話說回來
其實係咩牌子？
咁偷輕法其實會唔會唔好踩？在你實際踩過的感覺中…
回復 32# Homan
就係咁簡單，我因為不想開名，所以一開始已聲明 PM 問，自己友就答。
post #1 清楚講咗呢架係成車。
響上 post 提過響上水果架係 Trek，果 model 就唔記得，不過個樣就同普通單車差唔多，冇你 post 出嚟果 d 幾 lb 單車咁一睇就睇到係偷輕晒。
之於你話輕不一定好，呢點以經驗呢講應該係。從物理上看，太輕的話，動量就少，除非響宇宙航行，否則要經常俾能量去加速同 keep 速度，所以有 d 場合反而會用多咗體力。亦因為咁，鐵人車一般都會專登做重 d。
而響 MT bike，太輕的話，一來架車有可能一撞就玩完，二來同樣因為動量少，一遇到細細舊嘅石都會夾停架車。不過上山抬上山就舒服好多。
三來，最實際係，太輕嘅車貴，一架頂三架，我寧願買三架唔同玩法。
至於當日個人感受，感覺架車都幾扎實，反而可能中刀關係，踩上去架車唔覺輕，去到 30km/h 左右先有 d 去嘅感覺，不過一去即逝。上山就死晒，響新浪潭呢 d 路根本冇乜用。以前曾經踩過碟轆，中刀響平路就冇碟轆果種 "har har" 聲去嘅感覺 (以前果隻碟轆差唔多 5 lb)。
啊！ 我乜物理都唔識，
刀鈴起步／慢速難踩D係唔係因為條鈴重心在邊沿？
在高速時候去D係因為重心在邊沿慣性較大？
你咁問我又唔知點答你，因為我都驚講吓講吓自己都錯......
不如咁諗，你有一個齋 hubs，一個轆 (完整的轆，有 rims、線、hub)
你分別轉動 hubs 及轆，要令大家保持相同轉數，你應該會發現轉個齋 hubs 係好難，最多轉幾個圈就會停止；但轉個轆就可以轉得耐好多。
原因就係由於轆有部分質量響外圍，所以比齋 hubs 有大 d 嘅角動量；因角動量大，所以可以 keep 住自轉耐好多。
刀轆就係用呢個物理原理，令角動量增大，咁響平地上或者室內場地，可以保持 constant speed，不過當去到一般公路或者上山路，由於要額外花能量去轉動個轆 ( d 能量去咗角動量)，所以會用多好多力，因此需要高體能。
因此，好似鐵人賽，因為呢類賽事需要長時間保持一個高速度，而唔會有大彎位及紅綠燈，用刀轆的確好有幫助。但換作一般市區路 or 單車徑，除非有警察開路，否則行吓停吓，有時又要避車，刀轆不但唔快，仲不斷浪費體力。
先前都諗下刀軨, 不過上網搵過現實見過, 興趣已減 {:2_137:}
有體能及覺得自己係競賽場上係一名spinner,小刀可作一試.TT就不單要夾大刀,仲要夾飛機頭同helmet,先至做到保持高速加穩定作用.
本帖最後由 hongdonald 於 22-5-2011 08:09 PM 編輯
有體能及覺得自己係競賽場上係一名spinner,小刀可作一試.TT就不單要夾大刀,仲要夾飛機頭同helmet,先至做到 ...
willywong 發表於 22-5-2011 05:07 PM http://photomarket.hk/images/common/back.gif
我上文已提及,一般30~46MM刀係好好踩,因為現時既廠商都知道左刀軨起車難呢個問題，一般30~46MM刀已經做到係1300G樓下,更有品牌可以做到係1000G樓下既46MM刀(如LIGHTWEIGHT同RENOLDS RZR)，但去到30~35KM/H,你會發覺你用少好多力係對抗風阻上。
RE CFOO:
睇你踩咩路多,如果係青公居多既話,一般全能型刀如ZIPP 202/303,FFWD F4/5R係好適合係青公呢類靚路，相信起車亦會比你用緊既RACING 7易。
小弟都訂緊個TT車架番來，到時再測試。
架係用TREK SPEED CONCEPT 7.0 (已訂)
軨係用FFWD F9R(875G)+FFWD 碟軨(1265G) (已有)件用CAMPY SUPER RECORD TI EDITION(已有)
http://www.zipp.com/_media/images/dynamicproducts/202tubular_set.jpg
http://www.bikeexchange.com.au/dbimages/bike/fn_large/674/100182674/popup/trek_speed_concept_7.0_wsd.jpg
http://cdn.bicyclehero.com/catalog/product/cache/17/image/500x500/9df78eab33525d08d6e5fb8d27136e95/c/a/campagnolo_super_record_ti.jpg
http://bits4bikers.co.uk/img/6/1521/1.jpg
http://www.powercoachacademy.com/shop/images_powertap/ffwd_powertap_disc.gif
到時再到大家報告..
一位做人做生意都冇品嘅單車手，大家千祈唔好學。
egg_studio 發表於 22-5-2011 12:49 PM http://photomarket.hk/images/common/back.gif
可能佢有唔少貨係做獨家代理,如意大利既一王四后
人又地晚件唔憂做,的確比較串，我明咁既服務態度係有問題，但同佢熟左傾落好NICE..
頭小弟都係創新試過人地部TT BIKE
比較既感覺係重心好低轉灣差D炒車，搖車感覺好怪，直路上到40KM/H後部車好定，再用少少力已經上到45KM/H，是日使用普通HELMET，唔知換左TT HELMET會快幾多..