Face BB shell to use HT II, how does it feel?
07-18-18, 10:11 AM
#1
On the road
Thread Starter
Face BB shell to use HT II, how does it feel?
Recently, I bought a vintage Oyama (Taiwan) road frame from a local flea market when I was travelling around Java island.
To my surprise, it has a 70 mm BB shell English thread.
I've watched almost all videos related to BB especially ones from RJ The Bike Guy channel in youtube and read threads that talk about this sort of problem.
From what I could gather, the best option is to face the shell 1 mm each side and go with 68 mm BB.
My plan is to use a modern BB + crank (Shimano HT II) and keep it 7 speed.
I want to know if..
there's anyone here has had the same problem and gone with the same solution (face 1 mm each side) and use the same setup as I wanted (Hollowtech II BB).
Will it be alright? I mean, will there be any problem associated with the shell being machined when using the bike?
Or..
Is there better option?
Thank you.
J
To my surprise, it has a 70 mm BB shell English thread.
I've watched almost all videos related to BB especially ones from RJ The Bike Guy channel in youtube and read threads that talk about this sort of problem.
From what I could gather, the best option is to face the shell 1 mm each side and go with 68 mm BB.
My plan is to use a modern BB + crank (Shimano HT II) and keep it 7 speed.
I want to know if..
there's anyone here has had the same problem and gone with the same solution (face 1 mm each side) and use the same setup as I wanted (Hollowtech II BB).
Will it be alright? I mean, will there be any problem associated with the shell being machined when using the bike?
Or..
Is there better option?
Thank you.
J
07-18-18, 11:32 AM
#2
Bike Butcher of Portland
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You could just use a 70mm bottom bracket, and choose a crankset that works with it. Milling down a 70mm BB to 68 only requires a lot of elbow grease (and the right tool, of course).
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07-18-18, 08:13 PM
#3
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My bad, I see you have 70mm ENGLISH shell.
Shimano HTII cranks will fit 70mm shells. The Italian 70mm BB has thinner cups to accommodate this.
https://si.shimano.com/pdfs/dm/DM-FC0003-06-ENG.pdf
Shimano HTII cranks will fit 70mm shells. The Italian 70mm BB has thinner cups to accommodate this.
https://si.shimano.com/pdfs/dm/DM-FC0003-06-ENG.pdf
07-23-18, 09:59 AM
#4
On the road
Thread Starter
Do you know what brand sells 70 mm BB English threaded?
Thanks
Then I'll go with the machining instead..
Picture coming up soon
Last edited by jessejoshua; 07-23-18 at 10:05 AM.
