V20c disc brake adapter - solved

[Mathew Fy]

Does anyone know what disc brake adapter I need on the rear? I have 140 mm disc brake an SRAM Red (road) hydraulic caliper. @Robert Holler , @Jim Parker ?

 

[Randyc3]

If you have trouble finding a spacer, you could probably get one machined locally. Another option would be to make one from a hardwood and wrap in CF. The trick is to keep all attach points in line.

 

[Mathew Fy]

I have one coming from Amazon tomorrow. I’ll report how it works. Also available in red.

 

[Mathew Fy]

Close, but no cigar.

 

[Mathew Fy]

Next to try:

Flat mount forks and frames for 140 mm disc brake rotor | SHIMANO BIKE-EU

Flat mount forks and frames for 140 mm disc brake rotor. DISC BRAKE MOUNT ADAPTER

bike.shimano.com

 

[Beano]

Close, but no cigar.

This fits with a bigger rotor?

In the pic the adapter looks like it will fit if moved to the left, but would need maybe a 160 rotor?

 

[Mathew Fy]

This fits with a bigger rotor?

In the pic the adapter looks like it will fit if moved to the left, but would need maybe a 160 rotor?

It can’t be moved left without grinding off some frame.

 

[Frito Bandito]

It can’t be moved left without grinding off some frame.

How about grinding off some of the adapter instead? When I bought my V20 the previous owner put post mount disc brakes and 160mm rotors on it by grinding a small bit of paint and aluminum off, but I use rim brakes now.

 

[Randyc3]

I’d pass grinding on the frame. Shimano adapter is on the way…..right? See how that works. If not, I could probably create a new adapter for you in CAD, but you would still need to get it machined after we verify fit. Just an idea…..

 

[chicorider]

At the risk of asking a dumb question (seriously, I am terrible at visualizing such things), could you flip the adaptor the other way? Would the brake caliper still engage with the rotor? (I imagine you tried that already).

 

[Robert Holler]

Matthew - that looks like a I.S. style caliper but the V20C mount is flat style.

I am not sure there is an adapter to convert International Standard calipers for a flat mount (?) but I may be mistaken.

 

[Robert Holler]

Maybe I stand corrected:

Flat Mount to Post Mount Adapter

Adapters to convert flat mount forks or frames to post mount for 140mm and 160mm rotors. FF-2 front 160mm rotor FR-1 rear 140mm rotor FR-2 rear 160mm rotorf

trpcycling.com

Though I cannot say which one you would need. The brake adapter forest can be a difficult thing to navigate.

 

[Mathew Fy]

Maybe I stand corrected:

Flat Mount to Post Mount Adapter

Adapters to convert flat mount forks or frames to post mount for 140mm and 160mm rotors. FF-2 front 160mm rotor FR-1 rear 140mm rotor FR-2 rear 160mm rotorf

trpcycling.com

Though I cannot say which one you would need. The brake adapter forest can be a difficult thing to navigate.

Thank You, Robert.
It's good to search for the right term (Flat Mount to Post Mount Adapter.) I have a Shimano one (similar to TRP's FF1-F140) coming in a few days. I'll keep y'all posted.

 

[Frito Bandito]

Thank You, Robert.
It's good to search for the right term (Flat Mount to Post Mount Adapter.) I have a Shimano one (similar to TRP's FF1-F140) coming in a few days. I'll keep y'all posted.

Looking forward to it Matthew. I know that as soon as I buy the adapters then a lovely rim brake version of fast wheels will become available on discount in my area.

 

[Mathew Fy]

Yay, problem solved!
BTW the new rear end provides more room for disc brakes, you could go up in size if you desired.
I also have a photo of the front brake with the included adapter set for 180 mm discs.

 

[Robert Holler]

Most excellent!