Comments on: Montague Overhaul IV: BB and Cranks

By: Montague Bikes

Montague Bikes — Fri, 17 Jan 2025 14:59:55 +0000

If you’re changing the gear ratio, we would recommend getting a replacement Gates belt to fit the new ring/cog combination. The Allston is equipped with an eccentric bottom bracket to tension the belt, but it can only take up so much slack. Gates offers a belt size calculator, which can be found here: https://www.gatescarbondrive.com/products/tools

By: Jack Wilcock

Jack Wilcock — Sun, 05 Jan 2025 20:11:29 +0000

Would like to replace the front ring on my Allston gates carbon drive to climb the moderate hills in my neighborhood. Do I need an idler/tensioner as well? Any other options?

By: Montague Bikes

Montague Bikes — Fri, 09 Sep 2022 19:53:49 +0000

In reply to paul Miller. The frame is fundamentally different on the newer models that use the DirectConnect system, so unfortunately it's not possible to upgrade one of our older bikes. The DirectConnect unit bolts into a threaded section of the rear half of the frame, and the piece that it clamps to is a specific shape that is integrated (welded) to the front half of the frame.

By: paul Miller

paul Miller — Sun, 04 Sep 2022 08:24:01 +0000

Can I upgrade an old Crosstown fold mechanism to the latest DirectConnect™ folding system?

By: Jimmymalkho

Jimmymalkho — Fri, 06 May 2022 03:09:11 +0000

In reply to Paul Dowd. Hi besides the bb what model is the free hub. I have difficulty finding one that matches the original one. Nothing in the market looks the same or match the ori one. Thus I just have to service the ori one only. Would like to spare one. I'm riding a montague paratrooper. Tks.

By: Montague Bikes

Montague Bikes — Mon, 14 Mar 2022 16:08:45 +0000

In reply to Randy Jones. Hi Randy. Compatible tools are available from several manufacturers, but they would need to be made for Shimano / ISIS Drive 20-tooth splined bottom bracket cups. I would recommend the Park Tool BBT-22 or BBT-32. The BBT-22 can be fitted directly onto a 3/8" ratchet driver, which is nice.

By: Randy Jones

Randy Jones — Fri, 11 Mar 2022 03:32:17 +0000

I have a Montague Navigator that I would like to upgrade the bottom bracket. What tool would I use to remove the Bottom Bracket? Do you have the part number or name?

Thanks.

By: Montague Bikes

Montague Bikes — Wed, 05 Jan 2022 15:01:25 +0000

In reply to Paul Dowd. The crank on the Highline actually uses an Octalink bottom bracket interface rather than square taper. It's still a 68mm English threaded shell on the frame, but you would want something like the Shimano BB-ES300 with a similar spindle length (approx. 121mm).

By: Paul Dowd

Paul Dowd — Tue, 04 Jan 2022 20:57:47 +0000

Would I be able to use a SHIMANO BB-UN300 BSA 68 square taper bottom bracket for chain case mounting with a 122mm spindle on my 2016 Paratrooper Highline? I am having a tough time finding the BB-UN55?

By: Montague Bikes

Montague Bikes — Mon, 15 Nov 2021 14:49:38 +0000

In reply to Aerron Perry. The Boston uses a 68mm English threaded bottom bracket with a square taper spindle, and that spindle length on the stock BB is most likely 118mm.