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No question is a stupid question? Wheels


Norfolk chris

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Hi All, please forgive me for being a simpleton, however I would like to get a understanding on total rolling circumference and alloys/tyre size

I wish to purchase new alloys and tyres for my 2b, currently on it are 

14 x 6jj 38. 

Tyres 185/60r/14

So 14's with et 38

4 stud, is pcd 4x108?

I wish to get a set of 15'as carbon huggers to go accommodate 15's and better tyre choice, at the moment there is a few mm spacer on also, can people please confirm I could purchase a set of 

15 x 6.5 or does it have to be a 6 j

Tyres look mostly in 195/50/15

Is this the right size or what should I be looking for? 

Chris

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185 60 gives a wall height of 111mm (185*0.6) or 4.4inch so an overall diameter of 14 + 2*4.4 = 22.4 inches.

195 50 gives a wall height of 97.5mm (195*0.5) or 3.84inch with an overall diameter of 15 + 2*3.84 = 22.7 inches

So just over 3% bigger diameter.

8mm tread to 3 mm tread is 10mm diameter (new to just legal) is approx. 0.4 inches diameter so similar to your change.

Looking at manufactures technical data identically sized tyres have 3 to 5 mm differences in rolling radius

6 or 6.5 j will only be noticeable in very small fractions of a second on lap time.

wider tyre = slightly greater air drag.

I hope that this helps

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Most car tyres can be fitted to either but it is worth checking with the dealer before buying.

"JJ" refers to the shape of the wheel's flange (lip which holds the bead of the tire).

JJ = 18.0mm high x 13.0mm wide, with a 13.0mm radius
J = 17.5mm high x 13.0mm wide, with a 9.0mm radius

image.png.3120a9dee60160e4f90624533e2fa666.png

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