The joys of lightweight alloy wheels...

Rolling radius assumes two things, infact 3.

Tyres don't deform
The speedo is accurate
To have a rolling radius you need round wheels :p

The tyres look marginally narrow aswell?
 
Durzel said:
Apparently too low. :(

It's only 35 though, you can get lower. As said it's purely to keep the rolling radius the same so the speedo doesn't get thrown out.
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The profile is low not because its 35 but because the tyre is narrow, therefore a 35 profile is smaller than you'd expect :(

My rear tyre is also a 35 - but despite this you can see there is much more tyre even though the profile is the same:

contisport.jpg


I think really when your tyre is that low profile it kinda means your wheels are too big?
 
Had a crack with a hammer and a piece of wood, definitely improved it slightly but it's still visible. Going to take it down to the place where I got it refurbed so they can heat it up a bit and have another go.

Thanks for the advice all :)

To answer some questions..
- The alloys are 7.5J, so 225 tyres are "correct" for this I think (215 would be too thin). 235s probably wouldn't clear the arch.
- They were custom made in the offset for my car as "one offs" (a promotion for SSR), so I'd quite like to keep them if I can
- 18"s aren't really "big" for a Civic Type-R when the OEM wheels are 17" :confused:
 
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[TW]Fox;17469519 said:
The profile is low not because its 35
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Err, yes it is. I understand what you are saying, that sidewall height depends on tyre width, but very obviously it also depends on the tyres profile rating. 35 is the one of the lowest profiles commonly used on road cars; given the rim size on this car you couldn't get anything much lower in profile terms unless you were a VW owner stretching a woefully undersized tyre on it.
 
Got this fixed this weekend, was charged £47 for the privilege but they touched up the red lip as well and I was very happy not to have to pay for a whole wheel refurb. As I understand it they used a blowtorch to heat it up and tap it back into shape.

One thing I did notice on the way down using the satnav is that my speedo over-reads - when I was doing 70 indicated it was around 66 on the satnav. I'm wondering now whether or not 40 profile tyres would kill two birds with one stone - offer a bit more protection (could be negligible though I guess) and correct the speedo, or at least make it more accurate?
 
Durzel said:
Got this fixed this weekend, was charged £47 for the privilege but they touched up the red lip as well and I was very happy not to have to pay for a whole wheel refurb. As I understand it they used a blowtorch to heat it up and tap it back into shape.

One thing I did notice on the way down using the satnav is that my speedo over-reads - when I was doing 70 indicated it was around 66 on the satnav. I'm wondering now whether or not 40 profile tyres would kill two birds with one stone - offer a bit more protection (could be negligible though I guess) and correct the speedo, or at least make it more accurate?
Click to expand...

There are some websites around that give the calculations, so you can see what difference it will make.
 
As above speedos over read from the factory normally, that sounds about right for factory settings tbh.
 
Get a decent rubber hammer and tap it back into shape, won't be perfect but will look 100 times better than that.
 
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