TRP Spyre - facing post mounts

luv2ride

After continuing to have issues with the trP Spyres on my Pro6 disc, I accidentally came across this:
http://youtu.be/1T2RLgQoyvs
TRP have posted a vid that suggests getting post mounts faced. It also describes the symptoms I suffer from with the rear brake. Looking online, the Park DT-5 tool costs £250, so it's not realistic to get one myself. Therefore, it is likely an LBS would carry the necessary tools to do this? Given the increase in popularity of disk brake road bikes and 'crossers this might be the case, but I wondered whether anyone had any experience of asking their local shops doing this.

arlowood

[url=http://www.bikeradar.com/forums/viewtopic.php?p=19716457#p19716457]Luv2ride[/url] wrote:

After continuing to have issues with the trP Spyres on my Pro6 disc, I accidentally came across this:
http://youtu.be/1T2RLgQoyvs
TRP have posted a vid that suggests getting post mounts faced. It also describes the symptoms I suffer from with the rear brake. Looking online, the Park DT-5 tool costs £250, so it's not realistic to get one myself. Therefore, it is likely an LBS would carry the necessary tools to do this? Given the increase in popularity of disk brake road bikes and 'crossers this might be the case, but I wondered whether anyone had any experience of asking their local shops doing this.

Certainly not an economical option to splash out on a Park tool. I'm sure if you phoned around a few LBS's you could find out which has such a tool and what they would charge to carry out the facing process.

However your problem has highlighted something that I've recently noticed as a significant design difference between the TRP range of disc brakes and the SRAM Avid's - specifically the BB7's.

Reason is I've just swapped a set of BB7's from my new Planet X London Road for a set of TRP Spyres that came off my Genesis Equilibrium Disc. The BB7 set up has a pair of washers either side of the caliper mounting arm. These washers are domed so that, as far as I can see, they can be tightened up to take up any slight differences in the angle of the mounting post and thus ensure that the caliper is set up square to the rotor when you perform the installation.

This video shows some BB7's being installed and at around 4 mins into the video you will see the washers I am referring to.

https://www.youtube.com/watch?v=NasGJFtgq0A

Not sure if similar washers would work with the TRP Spyres - I think if you added such washers, the pads would not line up properly with the rotors. I have switched my Spyres over with the standard mounting bolts (ie only a thin flat washer under the head of the bolt.) and they have installed fine with no problems. Therefore if I had added more/thicker washers like these domed ones I think the alignment would have been compromised.

However it's something to consider as a solution that may be cheaper than the cost of refacing the post mounts.

luv2ride

Cheers. I'd reached a similar conclusion, in that I recall my old Avid Juicy and higher end hydro disc brakes also had the domed washer arrangement. Trouble is I think these would bring the Spyre calliper too far out from the rotor to be effective. Getting quite cheesed off with it though, after a tyre change and wheel reinstall last night, I had a draggy rear brake for most of my ride this afternoon - not fun. Sorted again now but it's getting to be a royal pain in the 'arris. Rim brakes have never caused me this much bother...

mikenetic

I think (although I may be wrong) that Avid has a patent on those domed washers in a disc brake application. Which is very annoying.