What Front Tyres?

**Guy Mayers** · 17-12-2011, 17:05

Yup - I've had 205*50*15 on the front and 225*50*15 on the back when the car was a Stradale but now it's Gp4 I went to 345*35*15 and 225*50*15s

Guy

**turbonutter** · 17-12-2011, 17:13

I can agree with Guy on that one - I had 205-50-15's front & 225-50-15 on the rear when I had my last car..

**ProtoTipo** · 17-12-2011, 17:40

Thanks chaps.

Any more votes for 205 50 ?

I don't know what the 215 TBs are for side wall ratio?, but that's the kind of side wall height/rolling diameter I prefer.

**turbonutter** · 17-12-2011, 18:48

205-50-15 is aprox 586mm diameter.

**turbonutter** · 18-12-2011, 08:55

Just found this spreadsheet that I used when looking at what tyres to fit to my car.

Click image for larger version.

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**ProtoTipo** · 18-12-2011, 09:50

Thanks Neil.

So a
205-50-15 is 586mm
215 TB15 is 612mm

I've also got (for 205)
55 ratio at 606mm and
60 ratio at 627mm

So maybe 205-55-15 would still be smaller diameter than a TB Michelin?

**turbonutter** · 18-12-2011, 10:42

I get ~607mm for the 205-55-15 which is more or less the same as the tyres you are replacing.. you wount notice 5mm difference ( its less than the diameter change due to tread wear.
Also as you can see from my spreadsheet the actual tyre sizes do not always exactly match the theoretical diameters either.