cyclw wing stay clearance

[Neil Harvey]

Currently running the R400 style wheels 175/55 - 205/55 CR500's with Freestyle Road/trackday Wide track AVO suspension set-up (flat floored by Gary May when Built

 

- done a few trackdays and been quite happy with set up ( for my numpty ability !) apart from the ground clearance to the sump is circa 50mm and a bit low for Road driving !

 

Looks like I'll need some new tyres in the next 1000-2000 miles so I was looking at keeping the CR 500's for track use , and was considering 185/70 A021's on 13" Minator rims for Road use - Good price from George Polley . ( no jokes about tractors please)

 

However having whipped ( Only took 2 bleedin hours with molegrips due to rusted bolts!) the wings off for Winter TLC , it doesn't look like I've got the extra 30mm of radial clearance to the diagonal bit of the rear stays - I looked up the build spec sheet and it says I've got race/15" stays

 

Any body fitted the above combination to such a set-up ? What about a different wheel offset ( I think the std is ET23 for the 13 x 6 " rims) or would this not be advisable.

 

As an alternative I was potentially looking at 15" wheels for a road set-up but perhaps with 195/50 scudo stunners ( bit cheaper fhan CR500's) ? Anybody fitted these to the set-up I've got ? Caterham suggested the 195/45 CR500's would fit but could't comment on the 195/50 profile

 

I guess I can change the ride height on the adjustment, although having had the car set up I was a bit reluctant to do this .Also it only looks like I've got about 20mm worth of thread to go on the damper thread , is it a 1:1 relationship How much ride height increase will this give ?

 

 

 

As an aside , can I mix a new CR500 with an Old one ? My spare 175 /55 13" ( just under 2 years old) is unused and I had hoped that buying one new tyre would give me a couple of new fronts

 

ta

 

neil

 

 

 

 

 

[Shaun_E]

I've got the race stays and 195/50 Stunners will not fit under them - I'm not convinced the 195/45s will either but I don't know for sure. I doubt that 185/70 A021Rs will fit either. 185/60 A021Rs or 185/60 A048Rs will both fit although getting them on and off is a bit tricky as they can foul the wing as they come off.

Avon changed the compound of the CR500 a while ago and it is possible that your spare is the old compound - you need to check before buying a single tyre to match it.

 

Yellow SL #32

[Neil Harvey]

Thanks,

 

Confirmed my thoughts

 

Anybody out there got the 195/45 15" CR500's with the race/15" stays ?? was this the R300 build spec??

 

What about the offset tho - I was surprised that it's the angled bit of the stay ( not the horizontal bit ) thats the problem, so moving the wheel out by a bit will improve the clearance to the stay ( possible give probs with the outer edge of wing tho')

 

Ta

 

neil

[Shaun_E]

To be honest, probably best to go back to Gary and ask him to raise the car by 15mm. You could do this yourself if you measure the ride height first - adjust each side an equal number of turns and maintain the same rake front to back - plenty of posts in techtalk on how to do this. To raise the ride height you screw the adjusters towards the spring.

 

Yellow SL #32