[bsmerin]

Morning All
I’m planning a build which is for a road bike in stainless steel, silver fillet brazed with flat mount disc brakes. The question I have, is relating to the placement of the brake bosses. To date, I’ve only used dropouts that have the calliper mounts included so this is new territory for me. I plan on buying a tool, probably the Farr Disco, to get the bosses in the right place, but could anyone give me some guidance on how to fit the bosses? I don’t have a lot of tooling so this hand filing for me. I’ve attached a photo of what I’m trying to achieve. I’m also assuming that silver brazing will be strong enough, but views on that are welcome.
Really appreciate the help.

 

[JackOfDiamonds]

Silver should be fine if the fit is correct.

 

[bsmerin]

Silver should be fine if the fit is correct.

Thanks for this. Do you think the fit is achievable by hand filing, assuming I have the correct placement tool?

 

[#/er]

It can be done with hand files. I did it in spring for a friend who wanted flat mounts with QR dropouts. But if you’re building for thru axles, I would choose PMW dropouts with the mounts integrated into the design.

 

[JackOfDiamonds]

Thanks for this. Do you think the fit is achievable by hand filing, assuming I have the correct placement tool?

I don't know any other way, really.

 

[bsmerin]

It can be done with hand files. I did it in spring for a friend who wanted flat mounts with QR dropouts. But if you’re building for thru axles, I would choose PMW dropouts with the mounts integrated into the design. View attachment 1953856

Thanks for comments. The build is indeed for 12mm through axle. With that in mind, why are you saying to go for PMW integrated dropouts? I can’t see any options for minimalist round rear dropouts like the ones in my photo that also have the caliper mount integrated.

 

[#/er]

These are what I was referring to. They save time, look nice and the mount position will be perfect

 

[#/er]

This is a view of them on a bike I made for my daughter in spring

 

[bsmerin]

This is a view of them on a bike I made for my daughter in spring View attachment 1953893

Thanks for that, lovely bike and I may use those dropouts. Other than easier to use, ie the location will be spot on, was there any technical reason you were thinking of that means I should not go with just the bosses and round dropout in combination with a through axle?

 

[#/er]

Ease of fabrication is my main reason to mention the dropouts with mounts.
The only other concern I had was how deep I had to cut into the CS to get the brake mounts positioned correctly. With the CS angling in toward the BB, the front mount was more than halfway thru the chainstay.

 

[bsmerin]

Ease of fabrication is my main reason to mention the dropouts with mounts.
The only other concern I had was how deep I had to cut into the CS to get the brake mounts positioned correctly. With the CS angling in toward the BB, the front mount was more than halfway thru the chainstay.

Yep the depth of the CS cut for the front boss is something I’m slightly concerned about. It will be in Reynolds 953 so hoping the strength required will be there. Definitely the dropout you shared is the safer and easier fabrication option.

 

[eMcK]

These look really close to what you are after.

TANGE LR26-A-1 FLATMOUNT DROPOUT 12X 1.5 THRU AXLE — BICYCLE FABRICATION SUPPLY

TANGE LR-26-A-1 FLATMOUNT DROPOUT SYSTEM FOR THRU AXLE 12MM X 1.5 THIS DROPOUT ALLOWS FOR FREE ANGLE OF THE SEAT STAY THE BRAKE SIDE HAS INTERGRATED PLUG FOR CHAINSTAY DROPOUT INTERFACE . THE OD OF PLUG IS 14.5MM WHICH WILL ACCOMMADATE MOST CHAINSTAYS WITH A .6MM OR .7MM WALL THICKNESS. THE HO

www.bikefabsupply.com

 

[bsmerin]

These look really close to what you are after.

TANGE LR26-A-1 FLATMOUNT DROPOUT 12X 1.5 THRU AXLE — BICYCLE FABRICATION SUPPLY

TANGE LR-26-A-1 FLATMOUNT DROPOUT SYSTEM FOR THRU AXLE 12MM X 1.5 THIS DROPOUT ALLOWS FOR FREE ANGLE OF THE SEAT STAY THE BRAKE SIDE HAS INTERGRATED PLUG FOR CHAINSTAY DROPOUT INTERFACE . THE OD OF PLUG IS 14.5MM WHICH WILL ACCOMMADATE MOST CHAINSTAYS WITH A .6MM OR .7MM WALL THICKNESS. THE HO

www.bikefabsupply.com

Yea, these look ideal. I’m guessing they’re steel though not stainless?

 

[bsmerin]

Yea, these look ideal. I’m guessing they’re steel though not stainless?

FYI, I just messaged Andrew from BFS. The stainless steel versions have just landed. 😃