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Correct spindle length for a Dura Ace 7400?(16 posts)

Correct spindle length for a Dura Ace 7400?Juanmoretime
Jan 19, 2004 4:06 PM
A friend picked up a used crank and I want to check for the correct spindle length, I thought for the 7400 it was 102, I could be wrong.

Thanks,

J
Try a 112 !the bull
Jan 19, 2004 4:23 PM
I have used a 110mm with out any problems.
Good luck!
103 is the correct one.....nmRusty Coggs
Jan 19, 2004 5:27 PM
nm
Dura Ace 103's are out of production.MR_GRUMPY
Jan 19, 2004 5:52 PM
You might have to use a 107. What's 2mm on each side ?
Nope. 103 for 7410 cranks and 112 for 7400Dave Hickey
Jan 20, 2004 4:31 AM
7410 are the low profile cranks. They are the last generation tapered spindle cranks. They use a 103 bb. The 7400 use a 112. FYI, there is a NOS 112 BB for sale right now on Ebay from Icycles.com
Is that the old non-cartridge BB ?MR_GRUMPY
Jan 20, 2004 5:20 AM
I forgot about that one.
yep....Dave Hickey
Jan 20, 2004 5:34 AM
Here's the link to the 7400.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3655938832&category=56195&sspagename=STRK%3AMEBWA%3AIT&rd=1
Wouldn't a 110mm cartridge BB work ?MR_GRUMPY
Jan 20, 2004 7:04 AM
People have gotten too lazy to use old style BB's.
Probably.Dave Hickey
Jan 20, 2004 10:52 AM
But if you can't find a 112mm cartridge, I'd go slightly larger instead of smaller. I'm not sure if the taper on the crank arms wear down as they get older, but the 7400 crankset is at least 10 years old. All of the installing and removing is bound to wear down the taper. So if you use a 113 or 114 BB, the chainline will be closer to the original 112mm.
Every bike is differentMR_GRUMPY
Jan 20, 2004 1:45 PM
I had a bike that I was able to use a 107mm BB with the old Ultegra crank. Other people have had to use the standard 115mm BB with the same crank. It would be nice if every frame used a standardized chainline.
frames and 'standard' chainline?Rusty Coggs
Jan 20, 2004 5:31 PM
Chainline for shimano octalink doubles is 43.5mm, and it's the same for current record and chorus.Thats standard chainline and it's crank and spindle length,that defines it. It's not about the frame, although some fat seattubes require a bit longer spindle in some applications. The old ultegra was speced with a 115 to give proper chainline, and the 107 biased it toward the larger cogs. Even older ultegras used an even longer spindle(122 I think) to get proper chainline due to a different crank design.
Thanks guys. Juan nmJuanmoretime
Jan 19, 2004 6:03 PM
PS The Bull was right according to Sheldon Brown. nmJuanmoretime
Jan 19, 2004 6:19 PM
Sheldon has had brainfarts too...Rusty Coggs
Jan 19, 2004 8:18 PM
I've got several 8 speed 7400 sries DA Cranksets that use a 103, and that is also whats listed for them in the old QBP.
Apologies t o SheldonRusty Coggs
Jan 19, 2004 8:27 PM
Correct if it's a 7400 or 7402. my reference was to 7410.
Apologies to Rusty, I didn't see this post.Dave Hickey
Jan 20, 2004 10:54 AM
I didn't see this post when I replied above...