2021 Marin Alcatraz Bmx bb

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2021 Marin Alcatraz Bmx bb
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flag camhenning27
Posted: Dec 22, 2022 at 6:01 Quote
I recently bought a used 2021 Marin Alcatraz. Great bike but my front foot hits the tire on barspins and x-ups. I want to swap the stock 170mm mtb cranks for 155mm bmx cranks. The problem is that I can't find a bottom bracket that will fit the bike and one that can accept bmx cranks.
flag splayleg
FL
Posted: Dec 22, 2022 at 6:32 Quote
https://20twentystore.com/collections/hope-tech/products/hope-evo-crankset-no-spider
Got these from them. Don’t know bmx standards to know if the axle length on bmx cranks would work for mtb. If you happen to have a 30mm spindle on your Marin then these will slide right in otherwise you would need a new bb
flag camhenning27
Posted: Dec 22, 2022 at 6:57 Quote
splayleg wrote:
https://20twentystore.com/collections/hope-tech/products/hope-evo-crankset-no-spider
Got these from them. Don’t know bmx standards to know if the axle length on bmx cranks would work for mtb. If you happen to have a 30mm spindle on your Marin then these will slide right in otherwise you would need a new bb

There lies the problem. I'm broke as hell. So the plan is to get bmx cranks and bb as theyre much cheaper.
flag splayleg
FL
Posted: Dec 22, 2022 at 7:22 Quote
https://www.profileracing.com/faq/q-and-a-which-spindle-do-i-need/
Found this looks like it’s possible. 155 is awesome when not pedaling. Good luck man!
flag mountainjew
Posted: Dec 24, 2022 at 23:49 Quote
73mm threaded bb shell.
Euro bb is what you need. They come in 19 and 22mm spindle/bearing sizes and include spacers usually.

BTW 155mm cranks will feel terrible to pedal, and if you ride any other bikes regularly it will feel even worse in comparison to those.
flag barp
Posted: Dec 25, 2022 at 10:12 Quote
splayleg wrote:
https://www.profileracing.com/faq/q-and-a-which-spindle-do-i-need/
Found this looks like it’s possible. 155 is awesome when not pedaling. Good luck man!

I love Profile Racing but... I think you missed the part where they said they're "broke as hell".
flag camhenning27
Posted: Jan 3, 2023 at 11:08 Quote
mountainjew wrote:
73mm threaded bb shell.
Euro bb is what you need. They come in 19 and 22mm spindle/bearing sizes and include spacers usually.

BTW 155mm cranks will feel terrible to pedal, and if you ride any other bikes regularly it will feel even worse in comparison to those.

Its a dirt jump bike so i dont intend on doing any enduro races on it. jsut the commute to the local spot which isnt all that bad.
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