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Dura Ace 7100 BB: Same as other Shimano 68/112 Spindles?

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Dura Ace 7100 BB: Same as other Shimano 68/112 Spindles?

Old 05-16-19, 07:10 AM
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jeirvine 
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Dura Ace 7100 BB: Same as other Shimano 68/112 Spindles?

I have a 1st gen Dura Ace crank and I need a BB. It seems to want a pretty narrow spindle taper. I tried it on Campy and an old Phil and neither BB seated very far into crank. According to this old Sutherland's image, "Old Dura Ace" has a short-ish taper. Velobase says 1st gen Dura Ace may a "low profile" JIS taper (7110), or ISO (GA-200), and a poster on Classic Rendezvous says "Sutherland's 4th Edition ominously states that the early Dura-Ace spindles are "not interchangeable with others." 6th Edition doesn't mention GA200 cranks or BBs at all.

I guess I could continue trial and error, but I thought it would be good to ask the hive mind. Can I get any old 68/112 Shimano spindle, add thin cups (pretty sure about that) and be good to go? Or do I need something more particular. 7400 BBs seem pretty common.

Thanks in advance,
-J



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Old 05-16-19, 11:18 AM
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Any JIS spindle will work fine with the square holes in the old D-A arms.

The "taper length" isn't something that one needs to worry about at all unless the spindle is expected to perhaps go too far into the hole, as when fitting a JIS crank on an ISO or old European taper.

I would just try what you have, maybe start by throwing a symmetrical 110mm JIS cartridge in for a test-fit to see where your chainline falls, and look to see how far that the spindle end is approaching the washer-bearing surface in the crankarm after tightening and then removing the bolt.

Again, JIS taper will work fine with these cranks and any taper width difference is very small.
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Old 05-16-19, 11:31 AM
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I have a 110 Phil that may be just the ticket. But again, if anything the spindle intrusion seems too shallow, rather than too deep. Thanks a lot.
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Old 05-16-19, 11:41 AM
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velo base lists 7100 as 112, 113 spindle lengths VeloBase.com - Component: Shimano FC-7110, Dura-Ace
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Old 05-16-19, 03:04 PM
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The last sentence of the axle end (first paragraph) says it all, "if it's too large, it's generally not a problem", no qualifiers, words to build by, carry on, make it so.
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Old 05-16-19, 06:47 PM
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Originally Posted by jeirvine View Post
I have a 110 Phil that may be just the ticket. But again, if anything the spindle intrusion seems too shallow, rather than too deep. Thanks a lot.
Are you first torquing the bolts to 30 ft-lbs before removing the bolts to check the insertion?
30 ft-lbs feels like a LOT, but is what is specified for virtually all sq-taper crankarms.

How far from the washer surface is the end of the spindle, can you perhaps gage it with something like a piece of wire or the end of an Allen key?

I would be installing that Phil bb and would only be concerning myself with the resulting correct chainline, which, being adjustable, should be easy to achieve.
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