Adding v-brake bosses to rear triangle of Anthem X

Machine up a v-brake boss adapter from 4mm aluminium plate:

Proof of concept / test bolt-up to frame using hose clamps:

Initial findings and results

The adapter works well, even when only held in place using hose clamps. The Anthem X rear triangle is, however, a little flexy in the horizontal plane on the seat stays. Put simply, if you really squeeze the brakes hard you can see the seat stays flex outward slightly.

A brake booster is probably needed, but unfortunately a custom made job will be required as there is very little room at the top of the triangle. A standard sort of brake booster might contact the seat tube at full travel of the rear suspension.


Now that I know the system works in practice, the hose clamps can be replaced with kevlar and carbon fibre. An initial kevlar wrap will be used to prevent direct contact of the carbon fiber to the aluminium (to prevent any electrochemical reaction taking place). Over the top will be the uni-directional carbon fibre wrapped radially. A final layer of your more traditional carbon fibre will be added to finish.

It is possible that the carbon/kevlar composite wrap will stiffen the rear triangle as well such that a brake booster will not be needed. If a brake booster is still required then I'll probably make a composite one to suit.

Related articles:

Adding v-brake bosses to rear triangle of Anthem X3

Here's the process:

Anthem X rear triangles compared

What cost progress?

Adding gears to a single speed BMX

Why a BMX?

Anthem X shock removal

There is no need to remove your cranks. You can get access to the lower shock bolt using a short 5mm allen key. If you don't have one, then just cut a spare allen key down:

Touring with the tandem and bob trailer

Did my first offroad bike tour with the tandem and the bob trailer. Was just a quick overnighter. Tandem tows the bob trailer really well. The long wheelbase of the tandem and the extra weight of two ...

San Marco Aspide Carbon FX Saddle

Vital stats: