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Will 235/40/17 Semi Slick Tyres Be Ok On A 17 X 9.5" Rim?

bozodos
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bozodos Grand Master

bozodos

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As per the title name, a mate bought some Federal 595RS semi slicks in the abovementioned size for his HR31, another mate reckons that a 40 profile is too small for the 9.5 wide rims he runs on the rear. He does have other rims if this is the case, anyone know one way or another?

some_cs_student Veteran

some_cs_student

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Why would a 40" profile be too small for a 9.5" wide rim?

And what brand of semi-slick is this....you might be able to check tire rack or similar:

http://www.tirerack.com/tires/Spec.jsp?mak...tirePageLocQty=

With a A048 235/45 is designed for a 9" rim at most, a 235/40 might make it on a 9.5" but I think you'd want to go 245 or 255.

I'm aiming for 255-40-17 in a non-semi slick.

Russman Grand Master

Russman

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little skinny for a 9.5in rim. I've had that same size on a 9in rim and it was fine. It's only 1/2 inch diff. Just give it a go. Depends what they want though.

I think what he means is that a 40 profile won't stretch that much.

bozodos Grand Master

bozodos

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Yeah was a little unsure, of course its illegal lol, and well 235/45/17 tyres don't seem to be too stretched on my 9.5" rims, was more of a concern about the bead rolling off the rim. Car's not really going to be used for any serious track work or drifting, more of a quick street car.

Bullet32 Veteran

Bullet32

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As per the title name, a mate bought some Federal 595RS semi slicks in the abovementioned size for his HR31, another mate reckons that a 40 profile is too small for the 9.5 wide rims he runs on the rear. He does have other rims if this is the case, anyone know one way or another?

The 235/40R17 Federal 595RS and/or 595RS-R is recommended by the manufacturer to be fitted to wheels 8.0" - 9.5" wide, so there shouldnt be any problems fitting these tyres to your wheels.

However, they may look a little stretched and will have almost no sidewall flex - ideal fitment for a 17x9.5 would be 245 or 255's.

595rs and rs-r and not semis, just sticky road tyres.

ya not sure about stretching 40's that much. federal do a r17 235x45 tho.

595RS and 595RS-R's ARE considered semi-slick tyres, not only by the manufacturer but by CAMS (Confederation of Australian Motorsports).

The term "semi-slick" simply means that the tread pattern has a lower void ratio than that of a "normal road tyre".

You are probably suggesting that these tyres arent "R-compound" cut slick tyres - and you would be correct... The 595RS-R is not a race compound tyre, however it has a softer compound than normal road tyres and a reinforced casing that is specifically designed to resist folding under extreme cornering loads - making it perfectly suitable for track use.

I hope this clears up any confusion :D

NZM.031 Grand Master

NZM.031

Posted
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you may have to find a good tyre fitter as semi slicks usually have a stiffer sidewall, so they are harder to stretch (especially if they are new), and a 40 series will have a pretty low sidewall... so low and stiff sidewall = difficult... but hey, worth a try. i know of someone fitting federal 595 215/40/17 to 17x9.5 and 17x10... i think they had to use the brake cleaner + lighter method though. damn good stretch though!

ssxRicho Grand Master

ssxRicho

Posted
Posted
The 235/40R17 Federal 595RS and/or 595RS-R is recommended by the manufacturer to be fitted to wheels 8.0" - 9.5" wide, so there shouldnt be any problems fitting these tyres to your wheels.

However, they may look a little stretched and will have almost no sidewall flex - ideal fitment for a 17x9.5 would be 245 or 255's.

595RS and 595RS-R's ARE considered semi-slick tyres, not only by the manufacturer but by CAMS (Confederation of Australian Motorsports).

The term "semi-slick" simply means that the tread pattern has a lower void ratio than that of a "normal road tyre".

You are probably suggesting that these tyres arent "R-compound" cut slick tyres - and you would be correct... The 595RS-R is not a race compound tyre, however it has a softer compound than normal road tyres and a reinforced casing that is specifically designed to resist folding under extreme cornering loads - making it perfectly suitable for track use.

I hope this clears up any confusion :D

it does, thanks, i thought the term 'semi slick' was synonymous with r-comp tyres.

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