請問這種輪胎是本來就沒有胎紋的嗎?

pondodo wrote:
為什麼加入導溝會降低過彎速度???

是不是要增加輪胎的抓地力???


很抱歉並不是這樣...

先講一個觀點好了,並不是說越好材質組成的輪胎就不會打滑,基本上還是會的,那這種輪胎跟比較不好的輪胎差別在哪呢?
就是在遇到極限時的反應,不好的輪胎要喪失抓地力是一瞬間的,駕駛不會有反應救回的機會,好的輪胎要喪失抓地力前是比較漸進的,駕駛可以先感受到輪胎開始向外滑(這裡講的是彎道外側),並進行減速和修正路線來避免輪胎整個打滑失控

所以當初FIA限制輪胎必須有導溝(胎紋),是為了"減低"輪胎抓地力,好讓賽車手減低駕駛的速度,這是因為賽車越來越快,怕太快的速度會讓車手面臨重大危險的關係
pondodo wrote:
我沒這樣說吧~~我的...(恕刪)


那這方面是小弟誤會了,抱歉抱歉喔
我找到我要的答案了~

輪胎屬於彈性物~
所以在乾燥剛性路面.(柏油路賽道)光頭胎有較大得接觸面可以有較大的抓地力~
這是正確的~

剛性物則反之~(拍謝)我一直以剛性物體考量~

沒有爭辯..沒有成長..

受教了~也導正小弟之前錯誤的觀念
看來很多車友也都有在看Formula 1
FIA 增加胎紋是爲了降低輪胎和地面接觸面積而到減少抓地力目的

因為抓地力變少了 相對的過彎速度就要變慢 這就是FIA的目地
我想轉撥當中 羅賓應該解釋過N次了

增加胎紋還有一個作用是不讓車隊過度磨耗輪胎
因為過度磨耗可能會造成比高速中瞬間爆胎的可能
所以有規定胎紋不能磨到看不見(詳細規定忘了)

我想知道這些相關知識的人一定很多
大家和和氣氣多多討論 受惠的是眾車友們
我絕得大家都把他想的太複雜了,
簡單的物理原力,竟然這麼多人解釋的這麼複雜,
抓地力的好壞若在物理上來說,
簡單說就是作用力與反作用力上,
F1賽車的馬力很大(作用力),
他為了需要快速達到極速(直線加速或彎道中速度),
所以需要藉由輪胎對地面來產生反作用力,
那光頭胎就是最好的選擇了,
以點、線、面來說,
光頭胎可以獲得最大的反作用力(相同摩差係數材質的輪胎),
但是若有外在因素就不可如此講了(例如:水、砂、泥土)
美麗の曼
抱歉! 這麼久的文章還被在下挖出來

若照目前的結論來看,就台灣柏油路面而言,應該是算是 "平的" (相較於off load而言)
那應該是光頭胎與路面的摩擦係數較高,所以騎起來會較累囉!?

可是目前聽到車友/店員所說,怎麼都說巧克力胎騎起來會累很多?

請各位專家大大們解惑了,謝謝!
RBB213 wrote:
可是目前聽到車友/店員所說,怎麼都說巧克力胎騎起來會累很多..(恕刪)


因為您忘了一個很重要的因素~~~胎寬

公路車用的胎寬普遍上都很細.....而巧克力胎呢?我是沒看過有低於1.75的啦
而前面所有的論述之中,幾乎沒有人提到胎寬的問題;
我個人是認為,不同寬度的胎要比較抓地力是沒有意義的;
尤其是像公路車胎跟登山用巧克力胎這二者胎寬的差異之大,

另外,粗齒的巧克力胎因為胎塊(我覺得那已經不能叫做是胎紋了)的關係,
導致滾動時輪胎接地面的不連續性應該也是讓它比一般光頭胎或是密胎紋的城市胎費力的原因之一吧

以上的推論是我個人的意見,如有謬誤尚請先進不吝指正!
原來如此...
感謝天照大大的不吝賜教

那胎壓呢? 應該胎壓越高,接觸面積越小,摩擦力也越小吧!?
若要買單山車用外胎 (以柏油路為主),不失粗曠氣息又帶有高速效果的胎,是否如下?

* 胎面較細 ~ e.g. 1.5"
* 高壓 ~ e.g. 80psi
* 帶點紋路
大家好!"科學"的討論是很重要, 主觀、感覺不一定是對的。歡迎大家討論。
1. 公路单车来说: 胎是不須要有紋的。光頭胎便可以。有紋的車胎只是商業上的一種銷售手法。
2. 光頭胎在下雨天跟有紋車胎是一樣的。大家的摩擦力都會下降,光頭胎會容易打滑,有紋車胎也一像。但不會產生像汽車的hydro-planing現象,其中一個原因是单车的速度太低、胎壓很高。6.9bar胎壓的車胎在167km/h的速度時才會出現"水上飛行'現象。
3. 胎壓問題:請直接看廠家建議(不要胡亂聽別人說!!) 不同體重須要不同氣壓,太低壓阻力大,太高抓地力又不足!不同牌子的設計又不同, tube 跟 tubeless又不一樣.......直接看廠家說明書便OK!!大部份我們所遇到的問題廠家的說明書已經回答了,相信"科學"!
例如hutchinson:
http://www.hutchinsontires.com/en/conseils_pression.php
Road
TUBETYPE (with tubes)
< 60 kg / 130 lb = 6 bars / 87 psi
65 - 75 kg / 140 - 165 lb = 6,5 - 7,5 bars / 94 - 108 psi
> 80 kg / 185 lb = 8 - 8,5 bars / 116 - 123 psi


詳細請參考以下網址:
http://www.sheldonbrown.com/tyres.html

Tread for on-road use
Bicycle tyres for on-road use have no need of any sort of tread features; in fact, the best road tyres are perfectly smooth, with no tread at all!
Unfortunately, most people assume that a smooth tyre will be slippery, so this type of tyre is difficult to sell to unsophisticated cyclists. Most tyre makers cater to this by putting a very fine pattern on their tyres, mainly for cosmetic and marketing reasons. If you examine a section of asphalt or concrete, you'll see that the texture of the road itself is much "knobbier" than the tread features of a good quality road tyre. Since the tyre is flexible, even a slick tyre deforms as it comes into contact with the pavement, acquiring the shape of the pavement texture, only while incontact with the road.

People ask, "But don't slick tyres get slippery on wet roads, or worse yet, wet metal features such as expansion joints, paint stripes, or railroad tracks?" The answer is, yes, they do. So do tyres with tread. All tyres are slippery in these conditions. Tread features make no improvement in this.



Hydroplaning
Car and truck tyres need tread, because these vehicles are prone to a very dangerous condition called "hydroplaning." This happens when driving fast in very wet conditions, which can lead to the tyre riding up onto a cushion of liquid water. When this happens, there is a sudden and total lack of traction.
Cars can hydroplane because: Bicycles canNOT hydroplane because:
A car tyre has a square road contact, and the leading edge of the contact is a straight line. This makes it easier for a car tyre to trap water as it rolls. A bicycle tyre has a curved road contact. Since a bicycle leans in corners, it needs a tyre with a rounded contact area, which tends to push the water away to either side..
A car tyre is quite wide, so water from the middle of the contact patch can have trouble escaping as the tyre rolls over it, if there are not grooves to let it escape. A bicycle tyre is narrower, so not as much water is in contact with the leading edge at once.
Car tyres run at much lower pressure than bicyles. The high pressure of bicycle tyres is more efficient at squeezing the water out from under.
Cars go much faster than bicycles, again leaving less time for water to escape. At high bicycle speeds, hydroplaning is just possible for car tyres, but is absolutely impossible for bicycle tyres.


hcc201 wrote:
大家好!"科學"的討...(恕刪)


好文 之前很多人都以為光頭胎下雨天很會打滑
其實根本不會
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