smart51
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| posted on 5/4/06 at 11:42 AM |
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Wheel Rim Width
I am looking at some new wheels and tyres. The tyres are reccomended for use with rims from 6" to 7.5" wide.
What will be the effect of the wider and the narrower sized rims (other than the extra weight of the metal)?
[Edited on 5-4-2006 by smart51]
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smart51
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| posted on 5/4/06 at 06:31 PM |
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I guess the narrower rims will pinch the tyre more but how would it affect handling?
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Mark Allanson
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| posted on 5/4/06 at 06:40 PM |
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The optimum width of the rim should be 85% of the tyre width
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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smart51
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| posted on 5/4/06 at 06:45 PM |
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OK so 85% is best, which is 6.5". What would be the effect of fitting a 7" rim or a 6" rim?
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Liam
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| posted on 5/4/06 at 06:54 PM |
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Probably nothing you'd ever notice...
Liam
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britishtrident
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| posted on 5/4/06 at 07:00 PM |
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Wide tyres for the rim width = bad tyre squirms, more so with higher profile tyres.
Narrow tyres for the rim = no that bad partiularly on higher profiles.
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zilspeed
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| posted on 5/4/06 at 07:03 PM |
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I certainly remember at least one article I have read where the driver chose a wider wheel than was the norm for a given tyre width, purely to keep
the tyre under control - i.e. to reduce squirm.
May be worth lookin into.
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ned
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| posted on 5/4/06 at 10:08 PM |
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on our racecar (slicks) we went to wider wheels (well, split rim halves) and it stabilised the tyre wall flexand made the tyre more consistent.
personally i'd want the rim at least the same width as the tyre, something like 6" for 185 and 7" for 205.
imho
Ned.
beware, I've got yellow skin
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Fred W B
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| posted on 6/4/06 at 06:04 AM |
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This is what my wheel/tyre supplier told me -
Quote
Ok, the tyre sizes. For road tyres (tyres you buy from your local tyre supplier), the widths are generally wider for a certain size rim. But for
race tyres (slicks or Dunlop R's), the sizes I gave you are what were recommended by my supplier and by a fellow race freak!! What will happen
if you go wider, is that the tyre will roll too much on the sidewall, and you'll end up stuffing up the sides of the tyre before you've
made good use of the centre, plus you will have to use a very high tyre pressure to try keep the sidewalls hard, which will be at the expense of
handling. I had this exact conversation with another racer today!! He now wants wider wheels from me, so that he doesn't have to lose out on
tyre width.
Unquote
On his reccomendation I am going with 195's on 7" and 205's on 8" rims
Cheers
Fred WB
[Edited on 6/4/06 by Fred W B]
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