[robz71lm7]

It can be viewed here:
http://www.jegs.com/webapp/wcs/stores/serv...11919&langId=-1

Any thoughts on the effectiveness? I've never seen one up close so I can't tell a whole lot about it. I already have a Grant Formula 1 wheel and can get this lock cheap.

[Blainefab]

Rob - I don't have a problem with the 3ea 1/4" bolts - every QD that I have seen has this fastener size on the same circle, and the increase in the lever arm length acting on them is only 5% more because of the 1 7/8" spacers.

My thought (and my engineering background is electronics, so someone please correct me if I'm wrong) was that worst case load on the 6ea 10-32 bolts would be turning the wheel with no power assist, car stationary. It takes a pretty good tug to move a 295 Hoosier. It that case I don't see shear doing much but trying to tilt the 1/2" dia spacers, translating to tension on the bolts. If the area of the 6 bolts adds, then there is 17,000# min tensile strength. Even if the driver can tug 100#, that is 2750# of force, over 6x margin.

You and Mark bring up the other force - fore and aft. This is in a race car, so wheel will be off the column while driver is getting in/out. Harnesses keep the driver in place on track so no need to brace against the wheel. But say I ignore that and figure the driver will try to do pullups on the wheel, how many of those six bolts are carrying the load? If some are in compression (or net zero load cause the spacer is in compression) then the rest are taking all the load. If 3 are taking the load then my margin is cut to 3, if everything is on 1 bolt then I have no margin.

I have a couple of weeks before this car sees the track, I will redesign the spacer setup if this is the case.