from 19" to 20" rims
08-25-2012, 06:15 AM
#1
Drifting
Thread Starter
from 19" to 20" rims
and increased circumference... with the added circumference is there a formula to calculate diminished delivery to the wheels? i know about unsprung wieght but i think the larger circle is a factor as well...thoughts...
08-25-2012, 06:17 AM
#2
Drifting
Thread Starter
the usual
08-25-2012, 11:11 AM
#3
Pro
The overall circumference of the 20" wheel and tire will be same or almost the same as the 19" combination as you will use a lower aspect ratio tire in the 20" set-up; ie there will be no " added circumference " otherwise your speedometer will be inaccurate.
What you mean by "diminished delivery to the wheels"? Never heard of that term.
What you mean by "diminished delivery to the wheels"? Never heard of that term.
08-25-2012, 05:32 PM
#5
Drifting
Thread Starter
just a bit of alliteration that happened to be there, i like that stuff, but seriously folks, it is like when you change gears on a bike, you find the larger gear you use on the final gear at the wheel the harder it is to pedal up a hill, in small increments it may not even be noticable(sp), but jump 5 or 6 gears and ...i did this same thing once on a vw bus, put maybe a 2" larger wheel on the rears cause i thought it would look cool, but all it did was reduce my top end from maybe 80 down to about 55, any even little hills and i was in 3rd gear...so i'm just thinkin that going from 19's to 20's won't be anything like that, and i also think i would use 245/35's and 295/30's as that is what is on the 991, i know going down an increment would give me almost the same circumference and with the 19's, but i don't want the 'rubber band' look
08-25-2012, 09:44 PM
#6
Official Rennlist Snake Slayer
Rennlist Member
Rennlist Member
I always find that using the larger gear on the bike makes it easier to pedal up the hill, not harder, as you stated....
Anyway, as somebody above stated above, circumference will not change too much, as you should use a shorter side wall tire on the larger rim. If you don't, I would think you may encounter rubbing issues.
If you want to improve the looks of your car with new wheels, I'd suggest some HRE's in OEM sizes, but maybe with a slightly more aggressive offset. You may gain a tad in rolling mass weight reduction you mentioned in your OP.
Anyway, as somebody above stated above, circumference will not change too much, as you should use a shorter side wall tire on the larger rim. If you don't, I would think you may encounter rubbing issues.
If you want to improve the looks of your car with new wheels, I'd suggest some HRE's in OEM sizes, but maybe with a slightly more aggressive offset. You may gain a tad in rolling mass weight reduction you mentioned in your OP.
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08-26-2012, 04:06 PM
#8
Nordschleife Master
