Originally Posted by
sambb
Gary I've got a chassis question for you. For me to fit 215's on my 7in rims and get them to fit under the arches (particularly at the back) I'll have to run thinner spacers front and back. If there's a gain in going up from 205's to 215's with mechanical grip, will it not be negated by having to shrink the front track by 20 mm and rear track by over 30mm to get them to fit? If the net gain comes down on the side of staying with 205's and retaining a wider track I'd do it. The only time at south circuit that I was traction limited under power was coming out of the hairpin in second. But it was sliding laterally a far bit on the down hill off camber left hander that lead down to the hairpin which 215's would probably help with. Curious what you think.
Nor sure that I understand the question Sam, a 215 is ~10 mm wider than a 205, so they add 0 mm to the track (if measured to the centre of the tyre) but they add 5 x 2 = 10 mm (if measured to the outside of the tyre). If you take 5 mm off the spacers, so that the tyres clear you are back to the same "outside" tyre track, which is all that really matters. The bonus is you have 10 mm more tyre contact patch ie; ~5% more.
The cheap solution would be to swap the front 20 mm spacers to the rear to reduce the rear track by 10 x 2 = 20 mm, but you would get 5 x 2 = 10 mm back with the wider tyre. Or you could spend a bit more and buy a pair of 25 mm spacers. Plus buy a pair of 15 mm spacers (~$75 with longer wheel bolts) for the front to replace the 20 mm ones, leaving the outside of a 215 in same place as a 205 with 20 mm spacer. Am I missing something?
Cheers
Gary
Last edited by Sydneykid; 28-05-2018 at 10:43 AM.
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