Help with tyre/rim measurements

Help with tyre/rim measurements

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nunuk

Original Poster:

57 posts

73 months

Monday 29th November 2021
quotequote all
Hi there,

I'm about to try some slicks for the first time (an unexpected gift cool ), but I'm not sure if they'll fit with the same stock rims I have on my SV 485S. The stocks are 185/55 R13 (front) and 215/55 R13 (rear) and the wheels are the Apollos' (6&8). Is there any way to know for sure if these will fit? S412

Don't know if they will fit under the front cycle wings, or if they will not be stock rims suitable because the different sizes from the stock tyres measures. Totally lost here. Any help would be apreciatted. Thanks!


Red Seven

156 posts

203 months

Thursday 2nd December 2021
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What sizes are you running?

Pretty sure 20/54's won't fit under your standard front wings, even if they fitted on your 6" wheels (which, I don't think they will).

20/54's fit well on 8" wheels, but you won't fit standard 8" wheels on the front.

We use nominally the the same size Pirelli's (200/540-13) on 7 1/2" MB's but with custom wings and stays.

F355GTS

3,743 posts

261 months

Thursday 2nd December 2021
quotequote all
I used to run 20/54 x 13 on 8" and 8.5" rears which worked fine, for the fronts they were 16/53 x 13 IIRC.

I did have a set fo the 23/57s but never fitted them, they didn't look like they'd fit in the rear arches

F355GTS

3,743 posts

261 months

Thursday 2nd December 2021
quotequote all
Also just checking, you do have a dry sump on the car?

nunuk

Original Poster:

57 posts

73 months

Saturday 4th December 2021
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Thank you all for your answers. I think I'm going to decline the slicks offer and change the 2 rim sets strategy for the ZZR for road and track use first, and if I'm not happy enough... we'll improvise.

Red Seven said:
What sizes are you running?
...
185/55 R13 (front) and 215/55 R13 (rear) Yes, I also think they would be too big on the front.

F355GTS said:
Also just checking, you do have a dry sump on the car?
Yes I do, but thanks for bringing that up because it's something to bear in mind when using soft compounds.

masterslamma

14 posts

111 months

Monday 6th December 2021
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I am running 20 54 and 24 57 michelin slicks on 7/8.5 rims since several years now.

I also tested my set on a friens 485 last year, the fronts did not fit.

On the front you will need wider wings and at least 7" rims.

On the rear its a very tight fit with standard wings, you can grind off the inside edge on your rear wings and if the car is not to low and the offset off the rim is perfect you can run 24 rears. But its very tight in all directions. I do this since 5 years and it works but when you test it the first time you have to be very carefull to not damage your rear wing. Most people run the 24s with 2" wider wings.


nunuk

Original Poster:

57 posts

73 months

Tuesday 7th December 2021
quotequote all
masterslamma said:
I am running 20 54 and 24 57 michelin slicks on 7/8.5 rims since several years now.

I also tested my set on a friens 485 last year, the fronts did not fit.

On the front you will need wider wings and at least 7" rims.

On the rear its a very tight fit with standard wings, you can grind off the inside edge on your rear wings and if the car is not to low and the offset off the rim is perfect you can run 24 rears. But its very tight in all directions. I do this since 5 years and it works but when you test it the first time you have to be very carefull to not damage your rear wing. Most people run the 24s with 2" wider wings.

That's a great piece of information, thank you very much sir.