Biggest rears that can be squeezed in?

[jellison]

Hi doing some research for a.n.other on what is the biggest tyre rim that can be squeezed under the rear arches of a Cerb.

Have spoken with SteveT and he gave me some good pointers.

But to clarify where I am on this:-

1) Think you can run an 18x9 rear with no clearance problems - but think the widest tyre that can be run on this is a 265/35?
2) I have heard that it is possible to get a 10" rim in there if you cut and internally box the inner arch (don't really want to do any external flares (eek), think you can then get in a 285?

Any help appreciated

[longbow]

lly, are you scoping an LS7 conversion by any chance?

[Brummmie]

I'm putting 265's on mine with the spiders, Pirelli P zero Rosso's in fact.

[Cerberab]

Brummmie said:

I'm putting 265's on mine with the spiders, Pirelli P zero Rosso's in fact.

What sizes on fronts?

[Brummmie]

I have gone up on profile on the front, i tried 225/40-18 Pirelli Corsas but they were too big, on lock they caught the inner sill, however i tried some P Zero's and they JUST miss, the same sidewall numbers but they are physically different. It can be a trial and error thing when your so close to the limit on what you can get in. Not tried a 235/35-18
on the front yet, but i'll try next time around maybe? The fronts are lasting well but rears i'm getting 2-3k.

[jellison]

9" on the front and likely the same on the back, but can you get a 10 in and is there an 18x10 tyre or around 285 that would go in with minor cutting of the "inner" arch.

[TVR SUPPLIES]

Red Rose spec RL7's were 18x9ET40 rears,and i've run 265's on a griff with a 18x9"ET40,so theres a good starting point for you,John

Edited by TVR SUPPLIES on Saturday 26th April 15:45

[TT Tim]

Brummmie said:

...the same sidewall numbers but they are physically different...

I found this changing tyres from Falkens to Dunlops, okay I went from 16" to 17" but I thought the 245 was across the width of the tyre, so profile or rim size wouldn't effect width.

Here's a pic of the difference between the two 245s:



Tim

[jellison]

Cheers guys - RL7's? Can they run 285's? and go in? Can chop the arch inside.

[HarryW]

Got a set of 18" RL7's in the garage and have been getting up the courage to use the rears, despite their reputation for air leaks and failing .

I've just been out and measured the rear widths, total rim is 9.75" (25cm) inner flange (i.e. where the tyre sits) is 9", need to put the wheel on something flat to measure the offset if anyone is interested (once I've walked the dogs down the beach that is).

[TVR SUPPLIES]

jellison said:

Cheers guys - RL7's? Can they run 285's? and go in? Can chop the arch inside.

This calculator says you need 9.5 width rims minimum,for 285's clicky
Harry,from what i'm told by a well respected specialist,it's only ever the fronts on the 18" Rl7's that he's seen crack.Would like to hear opinions from others on this,as to if they have experienced different?

Edited by TVR SUPPLIES on Saturday 26th April 15:56

[GreenV8S]

TT Tim said:

I found this changing tyres from Falkens to Dunlops

Road tyres are normally measured at the widest point, competition tyres are usually measured at the contact patch. Typically there is about an inch difference between the two. Maybe this accounts for the difference you're seeing here?

[ridds]

I have a set of 19 x 9.5's that fit on mine with 265 30 tyres. Just needed a little tickle to the inner of the outer wheel arch. You could get a wider tyre on with a smaller wheel. My 19's run a 40 offset on the back. There's a little bit more space on the inside so 37-38mm offset may be better.

[HarryW]

HarryW said:

Got a set of 18" RL7's in the garage and have been getting up the courage to use the rears, despite their reputation for air leaks and failing .

I've just been out and measured the rear widths, total rim is 9.75" (25cm) inner flange (i.e. where the tyre sits) is 9", need to put the wheel on something flat to measure the offset if anyone is interested (once I've walked the dogs down the beach that is).

#

The rear offset is 40/41mm by my tape measure if that helps anyone.

[jellison]

Hmm might have to settle for 265mm, Oh well worth try. Does not seem alot.

[TVR SUPPLIES]

jellison said:

Hmm might have to settle for 265mm, Oh well worth try. Does not seem alot.

275x25 will fit on a 9" rim

[Ron Fellows]

Mine ran 285s on a 10.5" wheel.

I had to cut the drivers side inner arch by 1" wide and 10mm back to allow full clearance and had to cut the outer underside of the passengers side arch to allow the clearance by about 6mm. If the body had been on perfectly straight I wouldn't have needed to do any of it

[jellison]

Ron Fellows said:

Mine ran 285s on a 10.5" wheel.

I had to cut the drivers side inner arch by 1" wide and 10mm back to allow full clearance and had to cut the outer underside of the passengers side arch to allow the clearance by about 6mm. If the body had been on perfectly straight I wouldn't have needed to do any of it

Cheers Craig.

[ridds]

For a bit more info.

II now haave 265/35-18 Ultrac Sessantas on 18" RL's on the back of mine with 235/40-18 on the fronts.

I'd previosly cut a a few portions of the front wheel arches to aallow clearance of the front tyres and had to trim back the edge of the drivers side wheel arch (outer) to allow the 19's to fit.

This allows sufficient clearance for the sizes and tyres a I have now although there is still a little rubbing the drivers rear under heaavy compression.

It's very dependant on if your body is central on thte chassis and the tyre sidewall shape.

I wouldn't recommend these sizes unles your prepared to do a little trimming and glassing.

[jellison]

ridds said:

For a bit more info.

II now haave 265/35-18 Ultrac Sessantas on 18" RL's on the back of mine with 235/40-18 on the fronts.

I'd previosly cut a a few portions of the front wheel arches to aallow clearance of the front tyres and had to trim back the edge of the drivers side wheel arch (outer) to allow the 19's to fit.

This allows sufficient clearance for the sizes and tyres a I have now although there is still a little rubbing the drivers rear under heaavy compression.

It's very dependant on if your body is central on thte chassis and the tyre sidewall shape.

I wouldn't recommend these sizes unles your prepared to do a little trimming and glassing.

Thread from the DEAD.

Very impressive though