Rim Sizes TVR Tuscan Mk1

[JimmyZZ]

Hello folks
Since I need new rims I want to double-check before

are these the correct measurements?

rear 8.5x18 5x114.3 et33 71.6 centre bore
front 8.5x18 5x114.3 et42 71.6 centre bore

Or should I go for a 9.5x18 on the rear?
What would be the right offset then?

Best regards in advance!

[fredd1e]

Those are the std 18" spider offsets though some might say they aren't correct. The front is supposedly better with a et39 offset, something to do with tyre being better aligned with hub steering axis. Silverstone performance (defunct) used to sell 3mm spacers to correct the front et42 to et39 and their Sp12 rims had the correct offset though a narrower 8j front. I run 19" 9.5 rears on my T350c with a carefully chosen et40 offset. I measured to get max inset to keep the tyre outer edge close to original spiders location whilst avoiding fouling of chassis leg going from outrigger diagonally up to top centre rail, using 255/30 tyres or 255/35 on 18" 9.5" rims.