Anyone Using Offset Crank Arms For 212cc Shift Kit?

5-7HEAVEN

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Hi.

I'm using a SickBikeParts one piece 226mm cartridge and aluminum cranks for my 212cc install in my Sixthreezero "In the Barrel" bike.

http://sickbikeparts.com/bottom-bracket-cartridge-226-mm/


The right-side crank arm has threads to hold the freewheel and 42-tooth chainring sprocket.
This arm has to be offset almost 2", and the left-side arm needs offsetting to match:

http://sickbikeparts.com/cranks-freewheel-isis-crank-set/

(Mine's standard taper; this ISIS pic shows the threaded part better.)

Should I have a welder offset these aluminum arms 2" each?

Another option would be to buy steel cranks having 1.75" offset each.
but the right-side would have to be modified to have male threads to accept
the freewheel and sprocket.

What should I do?
 
Last edited:
Eureka!

I came across this solution while removing my one-piece bottom bracket(BB) cartridge to install a Shimano GXP BB.

While doing so, I removed the original BB’s threaded cup in the bike frame.
It ‘has 1.37 x 24 tpi(threads per inch).

That’s the same thread count as generic freewheels!!

So I placed the offset crank arm’s base alongside the BB’s threaded cup.

PERFECT MATCH!!

Sooo, if I need to use these generic chrome offset crank arm’s with any shift kit, or my 212 engine’s build, all I need to do is weld the common BB threaded cup to the crank arm’s head!!

It’ll be a simple $20 welding job, instead of a $200 risky task of building up the arm, then carefully threading it to 1.37 x 24tpi.

What a relief!👍
 
Last edited:
Eureka!

I came across this solution while removing my one-piece bottom bracket(BB) cartridge to install a Shimano GXP BB.

While doing so, I removed the original BB’s threaded cup in the bike frame.
It ‘has 1.37 x 24 tpi(threads per inch).

That’s the same thread count as generic freewheels!!

So I placed the offset crank arm’s base alongside the BB’s threaded cup.

PERFECT MATCH!!

Sooo, if I need to use these generic chrome offset crank arm’s with any shift kit, or my 212 engine’s build, all I need to do is weld the common BB threaded cup to the crank arm’s head!!

It’ll be a simple $20 welding job, instead of a $200 risky task of building up the arm, then carefully threading it to 1.37 x 24tpi.

What a relief!👍
I like happy endings.
 
Another solution:

I’m also on a quest to run my 212 engine’s power through the bike’s bottom bracket(BB).

In doing so, I’m replacing the BB and installing a 13”spindle.

So I should be able to use my SBP crank arms without modifying them.

If the 13” spindle makes it look like a “clown’s car, I’ll shorten it to correct size.
 
Yeah, the head's surface just needs a bit of spot facing to ensure a perfect angle.

It fits well onto the threaded cup, but it's good to be sure.

The slightest error MIGHT throw the chain.
 
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