Conrad Posted July 25, 2007 Share Posted July 25, 2007 I read somewhere before on here that 19" wheels affect the speedo reading. Is this true and how does it affect it? ie faster or slower reading? Link to comment Share on other sites More sharing options...
Rayman Posted July 25, 2007 Share Posted July 25, 2007 think it depends on your tyre profile compared to what stock is. Think it ends up showing you slower than actual reading. Link to comment Share on other sites More sharing options...
Jake Posted July 25, 2007 Share Posted July 25, 2007 I read somewhere before on here that 19" wheels affect the speedo reading. Is this true Not true. Link to comment Share on other sites More sharing options...
Nic Posted July 25, 2007 Share Posted July 25, 2007 Provided you fit tyres with lower profile/aspect ratio so the rolling radius is the same, then the size of the wheels won't matter. Link to comment Share on other sites More sharing options...
hoff Posted July 25, 2007 Share Posted July 25, 2007 The tyre profile should be 35 at the front and 30 at the rear I think. This will then mean the rolling radius is the same as stock and therefore the speedo should not be effected. Link to comment Share on other sites More sharing options...
Conrad Posted July 25, 2007 Author Share Posted July 25, 2007 My tyre profile is 30, not sure what stock is. Link to comment Share on other sites More sharing options...
Rayman Posted July 25, 2007 Share Posted July 25, 2007 http://www.torquecars.co.uk/tuning/alloy-wheels.php Here you go, a calculator at the bottom. wow the rim size starts at 19" lol Link to comment Share on other sites More sharing options...
Jake Posted July 25, 2007 Share Posted July 25, 2007 The tyre profile should be 35 at the front and 30 at the rear I think. This will then mean the rolling radius is the same as stock and therefore the speedo should not be effected. Not as simple as that. The necessary profile depends on the width of the tyre. Link to comment Share on other sites More sharing options...
hoff Posted July 25, 2007 Share Posted July 25, 2007 Aah yeh good point. Im going to be running 235/35/19 and 365/30/19. I was told that was correct but of coures its the aspect ratio rather than just the profile. Link to comment Share on other sites More sharing options...
Rayman Posted July 25, 2007 Share Posted July 25, 2007 Better one:- http://www.alloywheels.com/tyrecalc.asp Link to comment Share on other sites More sharing options...
hoff Posted July 25, 2007 Share Posted July 25, 2007 That is great. Im going to be just 0.64mph out at 70mph. Good find. Link to comment Share on other sites More sharing options...
Rayman Posted July 25, 2007 Share Posted July 25, 2007 That is great. Im going to be just 0.64mph out at 70mph. Good find. Yep not bad at all! Of course it will put your mileage clocks out too if you run them at too much of a difference but thats seems fine. Link to comment Share on other sites More sharing options...
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