cymru-corrado 0 Posted June 2, 2005 Bought a 1.8 16v Corrado this morn. it comes totally standard with 195/50/15 profile tyres on however if i was to put my 15's from my mk4 polo which are 15x6.5 with 195/45/15 tyres on how much would it affect gearing and speedo would it read fast or slow? Reason i want to use my older alloys is cause well i really like them compared to standard Corrado ones. Opinions please? Quote Share this post Link to post Share on other sites
Timo. 0 Posted June 2, 2005 You will be going slower with the smaller wheels relative to the larger ones. But you'll get marginally better acceleration :) T. Quote Share this post Link to post Share on other sites
cymru-corrado 0 Posted June 2, 2005 faster accelerations good. how much would the speedo be out or in simple laymans language with 195/45 what speed will my speedo show when im supposed to be doing 30mph.and no funny answers like 30mph. Quote Share this post Link to post Share on other sites
Timo. 0 Posted June 2, 2005 There's little programs on the web for working it out. I'll try and have a wee search. T. Quote Share this post Link to post Share on other sites
cymru-corrado 0 Posted June 2, 2005 yeah i remember trying to use when when getting rims for my polo.put it in my favourites then deleted...bit dull now seen as i need it. Quote Share this post Link to post Share on other sites
Timo. 0 Posted June 2, 2005 current:- 195/50 R15 Diameter:- 576mm Circumference:- 1809.56mm new:- 195/50 R15 Diameter:- 556.5mm Circumference:- 1748.29mm Difference: -3.39% which is -19.5mm less in diameter and -61.27mm in circumference. Speedo reads 70mph, actual speed is 67.63mph But your speedo will read over the actual true speed with the standard tyres. You can usually go + or - 2.5% difference without affecting gearing and speedo. But since you are going to smaller wheels it shouldn't be too much of a problem. T. Quote Share this post Link to post Share on other sites
bristolbaron 11 Posted June 2, 2005 when your speedo reads 70mph, you're actually travelling at 67.63 mph calculator is on http://www.polo-gt.co.uk/ club polo website, in mech/tuning area. used to own a mk3 GT, so know the site well! Baz. Quote Share this post Link to post Share on other sites
cymru-corrado 0 Posted June 2, 2005 those were the figures i found using rochfordtyres. so if i go through a 30mph with speedo showing 30pmh i'm actually doing 27ish mph? correct? which means i can use my old rims...result! you Corrado people are helpful arent you? :wink: Quote Share this post Link to post Share on other sites
