Rickspit Posted February 22, 2015 Report Share Posted February 22, 2015 I'm replacing 40 year old Pirelli Cinturato 155 SR 13 tyres with new Pirelli ones. What side wall height should I go for in the newer code. 60, or 70 % of the 155 to be a close match? Thanks Rick Link to comment Share on other sites More sharing options...
Guest Posted February 22, 2015 Report Share Posted February 22, 2015 Hello Rick. What vehicle are the tyres going on to ?? Regards. Richard. Link to comment Share on other sites More sharing options...
KevinR Posted February 22, 2015 Report Share Posted February 22, 2015 If no profile height is specified then it is assumed to be 80. If the car is fitted with 155 13 (80) tyres now, then you should replace them with 155 13 80 tyres. Using any other 155 13 profile tyre will make the speedo inaccurate. If you want lower profile tyres then you need to also go for wider tyres to maintain the rolling radius. Lots of calculators out there, but this one is done by a Triumph owner - http://www.mintylamb.co.uk/?page=tyre.htm Link to comment Share on other sites More sharing options...
jondhm Posted February 24, 2015 Report Share Posted February 24, 2015 Hi Rick Assuming from your nickname that the car is a Spitfire, 155 13 80 are the obvious choice. 175 13 70 have the same approximate rolling radius, but you may run into clearance problems on the wheel arches. Also, you need to consider the width of your wheels. 155s are fine on 4.5J rims, but 175s really need 5.5J rims as I have on my GT6. Hope this helps. Link to comment Share on other sites More sharing options...
mishmosh Posted February 24, 2015 Report Share Posted February 24, 2015 165 80 13 fill the arches( and are a bit snug on the front ) but usefully raise the gearing. In fact wth a spit 1500 and j type box running through a 411 diff , the speedo over reads by 9 percent. Link to comment Share on other sites More sharing options...
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