Face BB shell to use HT II, how does it feel?
07-18-18 | 10:11 AM
#1
Thread Starter
On the road
Joined: Jul 2018
Posts: 51
Likes: 53
From: Jakarta, Indonesia
Bikes: Engine 11 Crit D Road
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
Joined: Jul 2014
Posts: 12,487
Likes: 8,057
From: Portland, OR
Bikes: It's complicated.
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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If someone tells you that you have enough bicycles and you don't need any more, stop talking to them. You don't need that kind of negativity in your life.
If someone tells you that you have enough bicycles and you don't need any more, stop talking to them. You don't need that kind of negativity in your life.
07-18-18 | 08:13 PM
#3
SE Wis
Joined: Apr 2005
Posts: 11,556
Likes: 4,333
From: Milwaukee, WI
Bikes: '68 Raleigh Sprite, '02 Raleigh C500, '84 Raleigh Gran Prix, '91 Trek 400, 2013 Novara Randonee, 1990 Trek 970
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
Thread Starter
On the road
Joined: Jul 2018
Posts: 51
Likes: 53
From: Jakarta, Indonesia
Bikes: Engine 11 Crit D Road
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.
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