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[Field Marshal Dr. Opti]

Any problem replacing standard fit 185/55/15 with 185/65/15?

The ride on the standard tyres is 'crashy'........and the 65 profile tyres are significantly cheaper.

Any advice, chaps.

[Lazydocker]

Only the possible insurance implications really... Is it one of the option sizes?

[Field Marshal Dr. Opti]

Only the possible insurance implications really... Is it one of the option sizes?

Not sure if a '65' profile tyre is listed as an option.

I'm guessing it will raise the gearing slightly. Hopefully the ride would be improved.

[Lazydocker]

Obviously there would be a slight under-read on the speedo too

[Field Marshal Dr. Opti]

Shouldn't be a problem if I sling a set of 65 profile tyres on.

[05omegav6]

Shouldn't be a problem if I sling a set of 65 profile tyres on.

If it's a size quoted in the manual for wheels of the same dimensions (diameter x rim width) then happy days...

[Field Marshal Dr. Opti]

Shouldn't be a problem if I sling a set of 65 profile tyres on.

If it's a size quoted in the manual for wheels of the same dimensions (diameter x rim width) then happy days...

Al.....I don't have the handbook to hand.

The 65 profile tyre has a larger overall diameter so I wonder if it may rub. 

[Nick W]

Shouldn't be a problem if I sling a set of 65 profile tyres on.

If it's a size quoted in the manual for wheels of the same dimensions (diameter x rim width) then happy days...

There is a lot of leeway for tyre and wheel widths, so I wouldn't worry about that. For instance, going back a few years, the tyre manufacturers suggested that a 205/60x13 tyre would fit a wheel between 5.5" and 8.5"! Not that it works very well at either end of that range.

If the 65 profile tyre is a standard Corsa size then they'll be fine. It's hardly a massive difference anyway.

[STEMO]

The middle number is a percentage of the width (first number). So 55% of 185 is 101.75 and 65% is 120.25, that's quite a difference.

[05omegav6]

The middle number is a percentage of the width (first number). So 55% of 185 is 101.75 and 65% is 120.25, that's quite a difference.

And why wheel width has a bearing..

[Nick W]

The middle number is a percentage of the width (first number). So 55% of 185 is 101.75 and 65% is 120.25, that's quite a difference.

There isn't a standard as to how you measure that 185mm(or whatever) so the actual width varies across different tyre brands.

[Field Marshal Dr. Opti]

The middle number is a percentage of the width (first number). So 55% of 185 is 101.75 and 65% is 120.25, that's quite a difference.

There isn't a standard as to how you measure that 185mm(or whatever) so the actual width varies across different tyre brands.

Yep.....I was amazed to find that a 235/45/17 Goodyear Eagle F1 was about an inch wider than the crappy 235/45/17 Michelin Primacy it replaced.

[STEMO]

The middle number is a percentage of the width (first number). So 55% of 185 is 101.75 and 65% is 120.25, that's quite a difference.

There isn't a standard as to how you measure that 185mm(or whatever) so the actual width varies across different tyre brands.

That clears things up nicely. 

[Toledodude1973]

I was lost 3 posts back

[05omegav6]

Happy with Dunlop Blueresponse... similar size, 195/65/15 V88, done about 1,100 miles and grip well in wet, dry,damp and frosty conditions, and reasonably priced