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TRP HY/RD Flat Mount Install Issue

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TRP HY/RD Flat Mount Install Issue

Old 04-03-21, 09:07 PM
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amerikaner
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TRP HY/RD Flat Mount Install Issue

Trying to install a TRP HY/RD Flatmount on my fork. There is not enough clearance to fit a hexwrench to tighten the top bolt. I checked the TRP manual and it doesn't mention anything special. Anyone else run into this??? I ended up scratching the caliper and still can't get it tightened even with a ball end hex wrench.


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Old 04-04-21, 12:07 AM
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I do not have experience with the specific brake caliper, but I have ran into similar issues.

My solution is to get a spare L shape allen key, cut down the shorter end and grind/file the end to make it nice and sharp so that it won't round out your bolt.
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Old 04-04-21, 02:23 PM
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Originally Posted by *Scuba View Post
I do not have experience with the specific brake caliper, but I have ran into similar issues.

My solution is to get a spare L shape allen key, cut down the shorter end and grind/file the end to make it nice and sharp so that it won't round out your bolt.
I find that cheap Harbor Freight tools are prime candidates for such modifications.
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Old 04-04-21, 06:41 PM
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If a ball style hex wont work then cut a straight piece short enough and put a wrench to it.
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Old 04-04-21, 07:18 PM
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So you don't run the risk of stripping out the bolt tightening it something like this would be your helper:
https://www.pbswisstools.com/en/tool...b-2212lh-10-rb

You could just also buy the single but you may find that set to be quite useful sometimes.
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Old 04-05-21, 08:07 AM
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Most hex wrenches are very hard steel, even cheap ones, and a hacksaw won't cut them. I cut them down (or refresh worn ones) using a Dremel and a cutoff wheel. Work slowly, dip the wrench in water frequently to avoid over heating it and smooth off the cut end with a grinding stone.
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Old 04-05-21, 09:54 AM
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Solved

Sacrificed a 4mm allen key from a extra set. Used torch to heat and bend then quenched bend area to harden (probably not necessary, but watching too much Forged in Fire). Cut off end to fit with hacksaw and filed to smooth. I did a S-type 90 degree bends so I can use a torque wrench with a 4mm socket. Keeping the Modified Allen Key 90 degrees to torque wrench I can torque to spec! Still not sure why TRP does not note anything about this issue in their manual. I emailed them and am waiting for their official response.

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Old 04-06-21, 04:36 AM
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I also have a hex wrench that I cut off with an air cut off wheel for a similar problem. The clamp bolt on SRAM road levers is a pain to get a wrench onto and the short wrench makes it so much easier. I have since found other uses for that wrench and one of them is a rear brake caliper with limited access to the rear mounting bolt.
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