berg Posted June 21, 2015 Share Posted June 21, 2015 (edited) Currently have 40 front and 35 rear on a 18" rim Will i need to drop to a 35 front and 30 rear if i go 19"? Im hoping to squeeze a 295 wide on a 19" 10J ET35 and the car is quite low so im not sure if a 35 profile will be too much with the 19" Edited June 21, 2015 by berg (see edit history) Quote Link to comment Share on other sites More sharing options...
JackyBoi Posted June 21, 2015 Share Posted June 21, 2015 I'd say get a 35 to be safe. I'm going for a 30 profile to start with on my 19s just to be sure Quote Link to comment Share on other sites More sharing options...
berg Posted June 21, 2015 Author Share Posted June 21, 2015 so 35 on back and 30 front? or 35 all round? Quote Link to comment Share on other sites More sharing options...
Samurai 20V Posted June 21, 2015 Share Posted June 21, 2015 I have 35 in front and 30 in the rear on my 19s.. Quote Link to comment Share on other sites More sharing options...
tony tt Posted June 21, 2015 Share Posted June 21, 2015 Had 30's on 19's before. Handling was terrible. Quote Link to comment Share on other sites More sharing options...
berg Posted June 21, 2015 Author Share Posted June 21, 2015 Ah i mixed up mine areactually 40 front 35 rear not the other way round Ill have a look at 35 front and 30 rear maybe just to be safe Handling wise shouldnt effect me, i dont batter it around or anything like that Quote Link to comment Share on other sites More sharing options...
tony tt Posted June 21, 2015 Share Posted June 21, 2015 Ah i mixed up mine areactually 40 front 35 rear not the other way round Ill have a look at 35 front and 30 rear maybe just to be safe Handling wise shouldnt effect me, i dont batter it around or anything like that I found at bpu on wot I had little grip on boost with 19's. Back end was very lively. Quote Link to comment Share on other sites More sharing options...
berg Posted June 21, 2015 Author Share Posted June 21, 2015 Hmm ill give them a try and see what they are like, if its too bad ill switch back to my rotas 18" Ive found tyre leader currently selling the Vredestein Ultrac Sessanta 295 30 19 for £81 each which is an absolute bargain Quote Link to comment Share on other sites More sharing options...
JackyBoi Posted June 21, 2015 Share Posted June 21, 2015 so 35 on back and 30 front? or 35 all round? 35 all round if you can. More profile, more traction Quote Link to comment Share on other sites More sharing options...
Nic Posted June 21, 2015 Share Posted June 21, 2015 Currently have 35 front and 40 rear on a 18" rim Will i need to drop to a 30 front and 35 rear if i go 19"? Im hoping to squeeze a 295 wide on a 19" 10J ET35 and the car is quite low so im not sure if a 40 profile will be too much with the 19" Stock tyre sizes: Front: 235/45R17 Rear: 255/40R17 Ideally you want to keep the diameter of the new tyres as close to stock as possible, use a tyre calculator http://www.willtheyfit.com/ to compare the stock tyres against the tyres you are considering. Quote Link to comment Share on other sites More sharing options...
berg Posted June 21, 2015 Author Share Posted June 21, 2015 Stock tyre sizes: Front: 235/45R17 Rear: 255/40R17 Ideally you want to keep the diameter of the new tyres as close to stock as possible, use a tyre calculator http://www.willtheyfit.com/ to compare the stock tyres against the tyres you are considering. I have had a check on there and it seems the width drastically changes the speedo reading more so than the profile change the 295 makes it 2.17% different to my current setup where as keeping it the same 265 with just the profile change makes it 0.17% different But how are so many people running such wide and extreme tyre setups if it makes such a huge difference? Pretty certain Hodge had 315 25 19 on the rear of his Quote Link to comment Share on other sites More sharing options...
Nic Posted June 21, 2015 Share Posted June 21, 2015 (edited) I have had a check on there and it seems the width drastically changes the speedo reading more so than the profile change the 295 makes it 2.17% different to my current setup where as keeping it the same 265 with just the profile change makes it 0.17% different But how are so many people running such wide and extreme tyre setups if it makes such a huge difference? Pretty certain Hodge had 315 25 19 on the rear of his That's because the profile (aspect ratio) of the tyre is the percentage of the width of the tyre 265/40R19 ie. the tyre sidewall height is 40% of 265mm = 106mm 295/40R19 ie. the tyre sidewall height is 40% of 295mm = 118mm 315/40R19 ie. the tyre sidewall height is 40% of 315mm = 126mm So the wider the tyre the smaller the aspect ratio of the tyre needs to be to keep the outer diameter the same. So Hodges tyres are 315/25R19 the tyre sidewall height is 25% of 315mm = 78.75mm Edited June 21, 2015 by Nic (see edit history) Quote Link to comment Share on other sites More sharing options...
berg Posted June 21, 2015 Author Share Posted June 21, 2015 I see In that case maybe i will stick with the same width i have now and go for a 265 30 19 for the rear instead of a 295 Shame really as the 295's are on offer and are nearly £50 cheaper each, than the 265 Quote Link to comment Share on other sites More sharing options...
berg Posted June 21, 2015 Author Share Posted June 21, 2015 (edited) Going from the 18" to the 19", the speedo will read lower than what im actually travelling correct? Edited June 21, 2015 by berg (see edit history) Quote Link to comment Share on other sites More sharing options...
CASHEYE Posted June 21, 2015 Share Posted June 21, 2015 I've previously used THIS website for working out anything tyre related. It's intended to show how a new tyre with different width/height/size will compare to the one you already have but it's also useful to see if, when you're buying new tyres for the front and rear, what the overall diameter of the complete wheel will be. It also shows you speedo differences too. Although I always thought that wheel size didn't impact speedo readings because its the revolutions of the axle not the wheel that is measured? Quote Link to comment Share on other sites More sharing options...
Scoot Posted June 21, 2015 Share Posted June 21, 2015 I have 275 40 on my 19s. Works well. Quote Link to comment Share on other sites More sharing options...
berg Posted June 21, 2015 Author Share Posted June 21, 2015 It also shows you speedo differences too. Although I always thought that wheel size didn't impact speedo readings because its the revolutions of the axle not the wheel that is measured? I suppose from a technical side, a bigger wheel would turn the axle less amount of times as a smaller wheel would, to cover the same distance Which i guess is why the speedo would read slightly lower than you are actually travelling with a bigger wheel Ive just answered my own last question Quote Link to comment Share on other sites More sharing options...
berg Posted June 21, 2015 Author Share Posted June 21, 2015 Think im looking into this too technically now, its a very small difference which will probably go un noticed Quote Link to comment Share on other sites More sharing options...
CASHEYE Posted June 21, 2015 Share Posted June 21, 2015 I suppose from a technical side, a bigger wheel would turn the axle less amount of times as a smaller wheel would, to cover the same distance Which i guess is why the speedo would read slightly lower than you are actually travelling with a bigger wheel Ive just answered my own last question Yeah that does make sense. What is the difference in complete wheel diameter between your existing wheel and the 19 inch with your preferred tyre choice? Quote Link to comment Share on other sites More sharing options...
berg Posted June 21, 2015 Author Share Posted June 21, 2015 Current first, then new Diameter 642.7mm 659.6mm Circumference 2019.1mm 2072.2mm Speedo error 0% 2.56% Reading at 30mph, 30mph 29.23mph Reading at 60mph, 60mph 58.46mph Quote Link to comment Share on other sites More sharing options...
CASHEYE Posted June 21, 2015 Share Posted June 21, 2015 close enough Quote Link to comment Share on other sites More sharing options...
berg Posted June 24, 2015 Author Share Posted June 24, 2015 Can anyone tell me if a 295/30/19 will fit the rear with a 10J ET35, arches are rolled right back already Speedo stuff aside, i just want to know if they physically fit Quote Link to comment Share on other sites More sharing options...
Nic Posted June 24, 2015 Share Posted June 24, 2015 With rolled arches they should fit fine. Quote Link to comment Share on other sites More sharing options...
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