Red3.2 Posted 31October, 2010 Report Share Posted 31October, 2010 Hi All, have just taken wheels (Fuchs) off my 87 3.2 to get them refurbished and new rubber, more than likely Bridgestone RE001, Question being the hand book states original profile was 195/65 R15 front, 215/60 R15 Rear,(7 & 8s). can any one enlighten me as to why the higher profile front. tyres on at the moment are Yokohama A509 205 & 225/50s which i have been happy with but are no longer available. if the higher front profile is a benefit i am thinking of going to 205/60 225/55 as it also give me more choice in tyres. would appreciate your feedback cheers Steve Red3.2 Link to comment Share on other sites More sharing options...
PCM911T Posted 1November, 2010 Report Share Posted 1November, 2010 Red 3.2 on the same size wheels, and after much delving and consulting of Porsche forums and my Porsche Performance Handbook, I fitted RE001s in 205/60 and 215/60 respectively. Ride and handling both improved considerably, with less front end understeer and a better ride at the back than 225/50(Falken ZE326). Good on the road and quite happy with them at Sandown sprints too. 60 profile allows the shocks to work properly also. Cheers Paul M Link to comment Share on other sites More sharing options...
Red3.2 Posted 3November, 2010 Author Report Share Posted 3November, 2010 Red 3.2 on the same size wheels, and after much delving and consulting of Porsche forums and my Porsche Performance Handbook, I fitted RE001s in 205/60 and 215/60 respectively. Ride and handling both improved considerably, with less front end understeer and a better ride at the back than 225/50(Falken ZE326). Good on the road and quite happy with them at Sandown sprints too. 60 profile allows the shocks to work properly also. Cheers Paul M Thanks for that paul, i will go for the 60 profile but 225/60 on rear. cheers Steve. Link to comment Share on other sites More sharing options...
Phat Bug Posted 17June, 2011 Report Share Posted 17June, 2011 A 195/65 R 15 will give you a tyre diameter of 634.5mm A 215/60 R 15 will give you a tyre diameter of 639mm The "profile" is measured in a percentage of the width, so just because it has higher "profile" it doesn't necessarily mean that the tyre will be taller. I hope this helps?? Link to comment Share on other sites More sharing options...
PCM911T Posted 17June, 2011 Report Share Posted 17June, 2011 Thanks Phat Bug, how about the diameter for 225/60R15 and the respective circumferences. And the bigger the circumference the taller the gearing and slower acceleration, right?? I worked on the principle that if the tyres have more or less equal rotational speed, the more likely handling would be balanced ( excluding other factors). What do you think? Certainly feels like my handling is more neutral. Cheers Paul M Link to comment Share on other sites More sharing options...
Phat Bug Posted 18June, 2011 Report Share Posted 18June, 2011 That right the taller the tyre the slower it'll accellerate (faster top end) 225/60 r15 diameter = ((225 x 0.60) x 2) + (15 x 25.4) 225/60 r 15 diameter = 651mm TYRE WIDTH PROFILE RIM SIZE Link to comment Share on other sites More sharing options...
jnr356 Posted 18June, 2011 Report Share Posted 18June, 2011 great info champ Link to comment Share on other sites More sharing options...
Phat Bug Posted 19June, 2011 Report Share Posted 19June, 2011 Thanks champ I'm a bit of a tyre perve Link to comment Share on other sites More sharing options...
D-banger Posted 19June, 2011 Report Share Posted 19June, 2011 A 195/65 R 15 will give you a tyre diameter of 634.5mm A 215/60 R 15 will give you a tyre diameter of 639mm The "profile" is measured in a percentage of the width, so just because it has higher "profile" it doesn't necessarily mean that the tyre will be taller. I hope this helps?? Ahhhhh. Never knew that. Thanks for the enlightenment. Link to comment Share on other sites More sharing options...
D-banger Posted 21June, 2011 Report Share Posted 21June, 2011 Link to tyre diameter calculater... Tyre Diameter Calculater Link to comment Share on other sites More sharing options...
Phat Bug Posted 22June, 2011 Report Share Posted 22June, 2011 Cheater! :lol: Link to comment Share on other sites More sharing options...
D-banger Posted 22June, 2011 Report Share Posted 22June, 2011 Cheater! :lol: for the mathematically challenged! Link to comment Share on other sites More sharing options...
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