View Full Version : What Front Tyres?
ProtoTipo
17-12-2011, 16:59
Can someone remind me:
For road tyres (rather than the 215 TBs) is it normally 205/50 x 15.
Or some other size? It's the aspect ratio I can't remember.
'Don't like the rolling diameter too small.
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.
1079
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.
Michelin Racing Size Designation
Road legal sizes
Rolling Circumference
Recommended Rims
16/53-13
175/60R13 72V
1640 mm
5 to 6 inches
20/53-13
225/45R13 77V
1635 mm
7 to 8,5 inches
15/60-15
170/65R15 77V
1847 mm
5 to 6 inches
18/60-15
215/55R15 79V
1885 mm
6 to 7.5 inches
23/62-15
270/45R15 86V
1923 mm
8.5 to 10.5 inches
26/61-15
295/40R15 87V
1891 mm
10 to 11.5 inches
29/61-15
335/35R15 93V
1903 mm
11 to 13 inches
Michelin TB15 sizing..
ChrisCar6
19-12-2011, 23:59
205 / 50 x 15" on my front
ProtoTipo
20-12-2011, 09:52
205 / 50 x 15" on my front
Thanks Chris.
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