Convert fork mount to hold rear dropouts
10-09-12, 09:22 AM
#1
Junior Member
Thread Starter
Convert fork mount to hold rear dropouts
Hi Folks --
I need some ideas on a simple way to convert a standard "truck bed" fork mount such as the picture below to hold the rear dropouts of a tandem with 145mm spacing. I see that 9mm works out to .354", so maybe some 3/8" all-thread (.375") would fit? Depends on how tight the tolerances are inside the fork mount. But with all-thread, there would be no quick-release, and it would be nice to have a quick release.
I could buy a replacement 145mm axle, but rear axles are 10mm, which is .394".
There are lots of fork mounts on the market, maybe someone knows one that would be easier than the others to convert.
Thanks!
I need some ideas on a simple way to convert a standard "truck bed" fork mount such as the picture below to hold the rear dropouts of a tandem with 145mm spacing. I see that 9mm works out to .354", so maybe some 3/8" all-thread (.375") would fit? Depends on how tight the tolerances are inside the fork mount. But with all-thread, there would be no quick-release, and it would be nice to have a quick release.
I could buy a replacement 145mm axle, but rear axles are 10mm, which is .394".
There are lots of fork mounts on the market, maybe someone knows one that would be easier than the others to convert.
Thanks!
10-09-12, 12:29 PM
#2
Senior Member
Join Date: May 2008
Location: Royal Palm Beach, Florida
Posts: 1,236
Bikes: 2006 Co-Motion Roadster (Flat Bars, Discs, Carbon Fork), Some 1/2 bikes and a couple of KTM's
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Honestly, your easiest option may be the threaded rod.
Remove that 9mm QR. Run a drill down the QR bore and open it to 3/8". Pick up your length of threaded rod, 2 plain nuts, 4 wing nuts and 4 flat washers.
Mount the cut to length rod into the Bike Tight and secure with a plain nut on each side. On each stub end, install backwards a wing nut, a pair of washers and the second wing nut installed normal. Accomplish the same for the other side.
Use the wing nuts and washers to secure the dropouts. Almost QR but not quite.
PK
Remove that 9mm QR. Run a drill down the QR bore and open it to 3/8". Pick up your length of threaded rod, 2 plain nuts, 4 wing nuts and 4 flat washers.
Mount the cut to length rod into the Bike Tight and secure with a plain nut on each side. On each stub end, install backwards a wing nut, a pair of washers and the second wing nut installed normal. Accomplish the same for the other side.
Use the wing nuts and washers to secure the dropouts. Almost QR but not quite.
PK
10-09-12, 04:13 PM
#3
Senior Member
Join Date: Jan 2008
Location: Ft Worth, TX
Posts: 1,971
Bikes: Custom 650B tandem by Bob Brown, 650B tandem converted from Santana Arriva, Santana Noventa, Boulder Bicycle 700C, Gunnar Sport
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I did the threaded rod thing for a quick fix but eventually bought a tandem quick release axle for easy in and out.
