7" CXR offset for front AP Brakes ?

[Ben Fung]

As the subject suggests.

 

Searching BC I've noticed a range for the offset is ET18-20 for 7" wheels, but doesn't mention if this is for the standard front calipers or for the uprated calipers.

 

I've got the big front AP brake calipers that come with an R400 and wanted to confirm if anyone has a set of 7" front CXR's on these and what offset they're running.

[rgrigsby]

I've got a set with ET15 that fit but they foul my CSR style wing stay so I'm changing them to ET18 or possbile ET20.

 

Forgot to mention that's with AP big brakes on the front.

 

Edited by - rgrigsby on 12 Sep 2011 16:31:06

[Richard Price]

Rob,

 

If you have ET15 wheels and they foul the wing stays, then you need to go to a smaller ET value.

 

If an MB wheel were made up to 7" with a 5" inner and 2" outer, then ist ET value would be ET13 (but then the normal front MB with 215 Kumho's is 7.5" with a 5" inner and 2.5" outer, which gives an offset value of ET6)

 

Ben,

If you were to specify 7" CRX's with ET18-20, then they would be slightly more inset than the standard caterham wheels, and may cause issues with wingstay clearance.

ET13 would closely match the tyre to stay clearance that you'd get with standard 6" wheels.

[catastrada]

I have CXR 7x13 ET24 and big brakkes

I had to bend a bit the wingstays (very easy job).

ET20 should be fine too.

 

(I have 2 complete sets of 4 CXR to sell : 7x13 ET24 and 8,5x13 ET24 - 1 set completely new, 1 set hardly used).

[Ben Fung]

Thanks guys it's looking like a smaller ET is needed.

 

Rob - I've got the standard wingstays (non-CSR) and they look different so the clearance may be different.

 

I'd rather avoid bending the wing stays and get the correct size if possible, but out of curiosity where do the wing stays need to be bent, wouldn't bending them mean the wings tops no longer be level?

 

Castrada - If I opt to bend the wing stays how much would you want for the wheels (postage to London) and what colour are they?

[6speedmanual]

If the inner edge of the rim/tyre is limited due to the wing stay, all the extra width goes to the outside which will have a significant effect on contact parch ground offset.

 

Peter

 

[catastrada]

On some cars you need to bend the wingstay on others you don't (it's a Caterham...).

If you need to bend it, it's really unnoticable.

 

Regarding the wheels I'm selling, YHM.