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Stephen Long
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Wheel nuts

Evening all, 

When it comes to preparing a Caterham for sprinting is it a requirement to have wheel nuts which are open (so that the threads can be seen) my standard wheel nuts are capped. 

 

Longy 

Guy Lowe
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Stephen, have a look at my reply /HERE

Cowering in a dark corner waiting for some clever dick to come along to correct or criticise my spelling and grammar Teacher

Guy Lowe
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Here it is, I'm getting better at this editing malarkey  Type   
 

For safety I prefer open wheel nuts, got a set from Dave at https://www.gemzoe.com/   I would have thought that Chris at http://www.redlinecomponents.co.uk/  will also stock them.

Cowering in a dark corner waiting for some clever dick to come along to correct or criticise my spelling and grammar Teacher

Wrightpayne
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Eliseparts stock them too. Mk1 Elise have the right thread / taper for Caterham wheels.

The early ford PCD hubs have short studs and the threads only engage a few turns (5 IIRC). There are posts in the archives on this.

Later hubs have longer studs. The studs can be bought from caterham. 

Regards

Ian

OldAndrewE
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Not involved in sprinting but just being nosey Wavey so looked up the regulations.  It seems in classes 1 to 5 the requirement is this (taken from MSUK regs for sprint and hillclimbing):

Wheels and tyres 10.4.

Must have any nuts securing road wheels, except those of centre lock type, of steel and in thread contact over a minimum length of 1.5 bolt/stud diameters. Extended or composite wheel bolts/studs are prohibited.

No mention of need for open nuts but you need to check stud length although open nuts make it easy for compliance to be checked

Andrew

1985 S3 1700 XFlow.  Undergoing full restoration

Comp Sec
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Stephen, to answer your original question, there is no requirement to have open wheel nuts for sprinting. 

Graham Howard - Competition Secretary   Northampton Motorsport Caterham & Lotus Seven Club Speed Championship 2022    
SM25T
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My 2002 car came with 32mm long studs. The nuts only engaged 3-4 turns. I replaced all the studs with 40mm long parts, as CC didn't want to know. Suspect the 32mm was a throwback to pressed steel wheels ?
Stephen Long
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Good evening all, 

 

Thank you all so much for the information.. 

The answer I liked best was 

there is no requirement to have open wheel nuts for sprinting,

 

thank you Comp Sec 

 

Longy