Charly Mitchel wrote: A about year ago someone had posted about how they had
strengthened the front hubs by bolting through the rotor into the hub. I
think it was taped and a long bolt threaded through the 2. Has anyone done
this and can you tell me of any tricks?
Charly,
I have done this and you need to do the following:
1. Drill out the threaded holes in the hub (for the rotor) to 25/64.
Continue drilling through the hub wheel mounting flange. Obviously, you
will need to mount the hub and use a drill press so that the drilling is
straight and perpendicular to the flange.
2. Counterbore the holes to 7/16" about 3/16" deep on the rotor mounting
flange.
3. Using a 7/16-20 tap, thread the holes (from the rotor side of the hub).
Continue threading through the wheel mounting flange so there are two
aligned threaded holes. This is important - do not thread the two flanges
independently.
4. Drill out the 4 mounting holes in the rotor to 7/16"
5. The only source for bolts with the correct unthreaded to threaded length
that I found was Bolt Depot (www.boltdepot.com). Order part number 760 -
Hex Bolts, Grade 8, Steel, 7/16-20, 1-3/4 long. Quantity 8.
6. I also drilled the heads of the bolt to accept safety wire and safety
wired them to prevent loosening. As a result, I used hardened grade 8 flat
washers instead of lock washers. I suppose either approach will work, but I
am an ex-motorcycle racer and we just love to safety wire stuff.
There are some pictures of the conversion at:
Hugh Barber
Hollister, CA
'73 TR6
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