l*******b
发帖数: 782 | 1 同一款车，轮圈尺寸大，是不是轮胎的尺寸也大，那车的重心是不是也提高了
还是轮胎外径是一样的，轮圈大对性能有什么提升呢。 |
e********y
发帖数: 350 | 2 轮胎外径都要保持一样。bigger rim 等于 shorter sidewall 等于 less flex 等于
response和traction 更好~
【在 l*******b 的大作中提到】
: 同一款车，轮圈尺寸大，是不是轮胎的尺寸也大，那车的重心是不是也提高了
: 还是轮胎外径是一样的，轮圈大对性能有什么提升呢。
|
c***x
发帖数: 628 | 3 Less flex =/= better traction.
【在 e********y 的大作中提到】
: 轮胎外径都要保持一样。bigger rim 等于 shorter sidewall 等于 less flex 等于
: response和traction 更好~
|
e********y
发帖数: 350 | 4 it does when cornering since contact patch will be flat.
【在 c***x 的大作中提到】
: Less flex =/= better traction.
|
l*******b
发帖数: 782 | 5 学习了
【在 e********y 的大作中提到】
: 轮胎外径都要保持一样。bigger rim 等于 shorter sidewall 等于 less flex 等于
: response和traction 更好~
|
c***x
发帖数: 628 | 6 What if you have very stiff sway bar? High negative camber? How do you keep
your “flat surface” flat on the ground on both straight and corner?
Some flex can also turn the sidewall into part of the contact patch which
increase the traction.
Have you ever seen any race car with super short sidewall?
【在 e********y 的大作中提到】
: it does when cornering since contact patch will be flat.
|
e********y
发帖数: 350 | 7 he is talking about going from 50 to 40/35 oe performance rims and tire, not
to those 25 side wall tires used by idiots. 钻牛角尖有啥意思，你怎么不说越
野车sidewall都很高呢~
keep
【在 c***x 的大作中提到】
: What if you have very stiff sway bar? High negative camber? How do you keep
: your “flat surface” flat on the ground on both straight and corner?
: Some flex can also turn the sidewall into part of the contact patch which
: increase the traction.
: Have you ever seen any race car with super short sidewall?
|
c***x
发帖数: 628 | 8 He actually did not mention any of that, and I was just stating facts not钻
牛角尖.
Less flex =/= better traction.
not
【在 e********y 的大作中提到】
: he is talking about going from 50 to 40/35 oe performance rims and tire, not
: to those 25 side wall tires used by idiots. 钻牛角尖有啥意思，你怎么不说越
: 野车sidewall都很高呢~
:
: keep
|
e********y
发帖数: 350 | 9 好吧~ 那按照你的逻辑，轮胎越宽 也不等于 更好的traction 。因为，虽然99%的时候
这是成立的，但在某些特殊环境下205完虐325。
【在 c***x 的大作中提到】
: He actually did not mention any of that, and I was just stating facts not钻
: 牛角尖.
: Less flex =/= better traction.
:
: not
|
c***x
发帖数: 628 | 10 Of course wider tires will have better grip, assuming you can use all the
grip provided.
But for the same width, shorter sidewall does not provide better traction.
Sometimes tire flex can even provide you extra grip, especially those with
rounded sidewall. Shorter sidewall gives faster and more direct response,
but that’s a tradeoff. You don’t have to agree with me, and that is fine.
:)
I’ll give you one more example: look at all the drag race cars, do they
have relatively high sidewall? They surely do need a lot of traction to go
fast.
Less flex = less heat
Less flex = quicker response
Less flex =/= better traction
【在 e********y 的大作中提到】
: 好吧~ 那按照你的逻辑，轮胎越宽 也不等于 更好的traction 。因为，虽然99%的时候
: 这是成立的，但在某些特殊环境下205完虐325。
|
|
|
e********y
发帖数: 350 | 11 ok.. I can see that tire flex might give more traction if you are fine with
riding on the sidewall.
btw, sometimes wider tire is bad in snow or even rain, because larger
contact patch = less pressure, while narrow tire can use the extra pressure
to dig in more into snow or break the water surface.
.
【在 c***x 的大作中提到】
: Of course wider tires will have better grip, assuming you can use all the
: grip provided.
: But for the same width, shorter sidewall does not provide better traction.
: Sometimes tire flex can even provide you extra grip, especially those with
: rounded sidewall. Shorter sidewall gives faster and more direct response,
: but that’s a tradeoff. You don’t have to agree with me, and that is fine.
: :)
: I’ll give you one more example: look at all the drag race cars, do they
: have relatively high sidewall? They surely do need a lot of traction to go
: fast.
|
c***x
发帖数: 628 | 12 没错呀，所以我才说越宽越好，前提是你能用到全部的grip。路滑，车轻，都有可能让
可用的摩擦下降。
轮胎高矮也是相对的，295/35/18会比245/40/18胎壁还高...
with
pressure
【在 e********y 的大作中提到】
: ok.. I can see that tire flex might give more traction if you are fine with
: riding on the sidewall.
: btw, sometimes wider tire is bad in snow or even rain, because larger
: contact patch = less pressure, while narrow tire can use the extra pressure
: to dig in more into snow or break the water surface.
:
: .
|
s*****8
发帖数: 606 | 13 It doesn’t worth to argue the side wall for street use, very rare of them
can be used over 50% of tires capability. If tire diameter change, it will
impact speed odometer and ABS. If only change the tire width, then as
everyone knows, it will impact the traction (for street, for race is a
different story)
Traction comes from tire slip angle, and slip angle depends on rubber
compound and load. Contact patch of course is a key factor, to maintain the
max contact patch will depend on suspension geometry and tire pressure.
After you find out the optimum tire pressure (short sidewall should have
more pressure than high sidewall) and compare with them, the high sidewall
tire should have a bit more contact patch, however the car will feel
sluggish and the sidewall will generate more heat. On the other hand,
Extreme low profile tire is too sensitive during high speed corning, you
will need more skills and cautions to handle the car. Overall, it’s not a
black or white answer to judge short sidewall is good or bad than high
sidewall (not consider the ‘extreme’ situation), it will depend on the car
setup and the driver itself. |
B*Z
发帖数: 7062 | 14 买个大轮毂和正常轮胎，odometer会比正常少，卖的时候还可以多买些钱，其实也不错。
the
【在 s*****8 的大作中提到】
: It doesn’t worth to argue the side wall for street use, very rare of them
: can be used over 50% of tires capability. If tire diameter change, it will
: impact speed odometer and ABS. If only change the tire width, then as
: everyone knows, it will impact the traction (for street, for race is a
: different story)
: Traction comes from tire slip angle, and slip angle depends on rubber
: compound and load. Contact patch of course is a key factor, to maintain the
: max contact patch will depend on suspension geometry and tire pressure.
: After you find out the optimum tire pressure (short sidewall should have
: more pressure than high sidewall) and compare with them, the high sidewall
|
f****i
发帖数: 20252 | 15 容易超速
错。
【在 B*Z 的大作中提到】
: 买个大轮毂和正常轮胎，odometer会比正常少，卖的时候还可以多买些钱，其实也不错。
:
: the
|
Y****a
发帖数: 17170 | 16
错。
一般换的时候，都要用相应的计算器算一下吧。
【在 B*Z 的大作中提到】
: 买个大轮毂和正常轮胎，odometer会比正常少，卖的时候还可以多买些钱，其实也不错。
:
: the
|
D**********s
发帖数: 3139 | 17 特殊环境呵呵
【在 e********y 的大作中提到】
: 好吧~ 那按照你的逻辑，轮胎越宽 也不等于 更好的traction 。因为，虽然99%的时候
: 这是成立的，但在某些特殊环境下205完虐325。
|
D**********s
发帖数: 3139 | 18 看看自行车，高速骑就赛车，怕颠就山地车。
【在 e********y 的大作中提到】
: 轮胎外径都要保持一样。bigger rim 等于 shorter sidewall 等于 less flex 等于
: response和traction 更好~
|
n*********n
发帖数: 5605 | 19 轮圈大 = 漂亮
【在 l*******b 的大作中提到】
: 同一款车，轮圈尺寸大，是不是轮胎的尺寸也大，那车的重心是不是也提高了
: 还是轮胎外径是一样的，轮圈大对性能有什么提升呢。
|
