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Old 09-15-2003, 01:36 PM   #1
Coati
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Question 16" tire size preference for rallycrossing?

Are there other conditions, besides snow, where one would prefer a 205/55 (or narrower) over a 225/50 "all-season" tire when rallycrossing?

Would (water truck induced) mud over hardpack dirt disadvantage a 225 over the 205 since the 205 might bite through a little better?

Other conditions anticipated: sand, silty flour sand, gravel over hardpack, hardpack. Not much loam or snow anticipated, but who knows?
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Last edited by Coati; 09-15-2003 at 07:37 PM.
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Old 09-16-2003, 07:11 PM   #2
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Bump!
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Old 09-16-2003, 07:40 PM   #3
Craig W
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From what I've seen on the WRC and at SCCA Pro-Rally events, the pros always run tires w/ smaller width on loose surfaces. They only run wider tires on tarmac. There must be a reason.
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Old 09-16-2003, 07:53 PM   #4
Coati
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Thanks! I was observing the real rally tires were tending towards narrower, too.

Time to ditch my bald-cornered 225/50 Dunlop SP-5000s for some 205/55 KDWS, maybe...
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Old 09-17-2003, 01:00 PM   #5
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Quote:
Dunlop SP-5000s
this tire just plain sucks on gravel or dirt. good on clay or wet tarmac though.
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Old 09-17-2003, 01:28 PM   #6
Coati
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Quote:
Originally posted by 10th Warrior

this tire just plain sucks on gravel or dirt. good on clay or wet tarmac though.
Thanks!

It was pretty amazing at the transformation: During real runs (where a water truck went through, then a grader, then one car then me -- in near 100-degree heat), the slurry on the surface was basically frictionless and my tires wouldn't bite through.

However, at the end of the day there were (water truck-less and grader-less) fun runs and the tires comparitively HOOKED up on the exposed, rutted surfaces. I shoulda hung at the back of the run group and let the others sweep the mud off.

It seems like the 205s might carry a relative advantage over the 225s in the looser conditions (soft over hard and soft over soft), and maybe the KDWS over the Dunlop in the same?
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