Dura Ace 7600 cranks + Shimano UN53
 

Thinking about getting some DA 7600 cranks only because they're being offered at what seems like a pretty good deal. However, they'd be going on a bike I ride in the rain (whose existing crankset/BB already needs replacing anyway), so I'd prefer not to have too expensive of a BB in there (7610). Can I get away with running a Shimano UN53 w/ 110mm spindle? Theoretically, it should mean the chainline maybe be off .5mm which is a hell of a lot better than my current drivetrain on that bike. Anyone done this?

What's the difference between the UN53 and UN54 bb?

Just an updated version I think.

53 and 73 models have been discontinued. The 54 is the replacement, combining the lower price point with some of the benefits of the higher end model (hollow axle, lighter weight).

As for the OP question, the 110 will work but you'd be better off with a 107 (the 110 has the non-drive crank arm offset 3mm further out).

Really? The 107 and 110 have the exact same drive-side spindle length?

Yep.

This way you could use a spacer on the drive side and get 1-2mm of adjustment from it.

So the 107 would probably work best for pairing with 75s as well?

First you have to join the coalition that believes the 75's are actually somewhere between ISO and JIS as far as their taper.

But yes, the 107 will work fine......at least for me.

According to Mr. Sugino, 75's are ISO.

Let's not get into that debate again though.

Is there a sealed BB people prefer to use with 75s over these Shimano ones? I forgot to consider the different tapers...

i did that for a couple of weeks (w/the 110mm version of the UN73). ran fine. i'm a perfectionist, though. in the end, i had to have the crank and bb match. shrug.

sweet. my rain bike is about to have a nicer crankset than my nice bike if things go through!

haha, love it when that happens.

So, my cranks are ****ed and I need to replace them tomorrow. I'm going to buy some Sugino 75s.

Will someone take pity on me and just tell me which sealed bb I should go with? My brain is too holidayed-out to figure this **** out for myself.

Everything you need to know is here.

In theory and according to Sheldon Brown, you can interchangeably use ISO and JIS tapers. What has resulted in practice?

For cheap, sealed ISO bb's, it looks like there's the Miche 107 mm (for which I have read rather mixed reviews) or a Campagnolo 111 mm.

Edit: Does anyone know which models of Campy bb's are symmetric and asymmetric? Its says here that Centaur, Veloce and Mirage 111 mm are symmetric. Can anyone confirm?

Awesome, thanks for your help. I'm looking at the Campy bb now, but being 111mm, it won't give me a perfect chainline with 75s correct? Perhaps the asymmetry is enough to compensate?

Ya after a bit more research I edited that statement, but I'm looking for confirmation. In any case, the 75s are meant for a 109 mm ISO symmetric. Using a 111 symmetric will put you out 1 mm and using the Miche 107 symmetric will put you in 1 mm. 1 mm doesn't sound like much to cry about, especially since there's probably some error when sliding the cranks onto the taper anyway. It's never going to be perfect.

i got a perfect chainline w/ 75's + campy centaur bb. however, i had the expert mechanic take care of it for me :D me may have had a trick up his sleeve

MP-BB-CAMP03 Campagnolo AC-S Cartridge Bottom Bracket
[Bottom Bracket Threading:English]

TRK-CR-SUG01 Sugino 75 Track Crank Set
[Crank Color:Silver]
[Crank Length:165]
[Chainring:75 silver chainring 44t]

TRK-CH-IZU02 IZUMI "ECO" 1/8" Track Chain
[Chain Color:IZUMI ECO GOLD]

TRK-COG-EAI02 Euro Asia Superstar Track Cog 1/8"
[Teeth:17 tooth]


...Hopefully that works...

miche cups are adjustable...

there is, as you probably know, a shimano dura-ace 109mm sealed njs bottom bracket. they are the recommended bottom bracket for the DA 7600 series cranks. not dreadfully easy to find, but the best way to go if you can dig one up.

that's the thing, they're tough to find and usually come w/ the crankset.

sette cycles had those BB's 8 months ago.

I run a un53 107 w/ my 75's and it's fine. I just overhauled my drivetrain today and the BB is still spinning smooth after about 2 years, too.

Lol, why? I like to use the hand-me down system:
my nice bike -> my gf's nice bike -> my rain/lockup bike -> her rain/lockup bike -> the part box
(though we're getting to a point where some of her components are nicer than mine...)