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Bottom Bracket for Dura Ace 7600 Cranks

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Strangely, finding a bottom bracket to work with the Dura Ace 7600 is unnecessarily hard.

Does anyone know, DEFINITIVELY, with measurements, if the taper for 7600 NJS cranks is ISO or JIS?

I've scoured the web and I'm finding 50% of people saying it's JIS and 50% saying it's ISO...

Some websites that list the compatible 7610 hub even list it as JIS, but I'm not sure how accurate that is.

The only thing I know for sure is that the spindle should be 109mm. I want to know if it's JIS or ISO because I'd like to run a White Industries bottom bracket, which is only JIS and 108mm.
     
November 4, 2014 09:49 PM
INFIDEL
37 posts
0 bikes
Japanese, I'm willing to put my money on JIS. ISO((campy, euro/ital)) is a very small amount of bottom brackets compared to what's available for JIS but that's my experience
     
November 5, 2014 12:13 AM
jamesepoop
From: Orange, CA
47 posts
3 bikes
And found this in two minutes

http://velobase.com/ViewComponent.aspx?...
     
November 5, 2014 12:17 AM
jamesepoop
From: Orange, CA
47 posts
3 bikes
     
November 5, 2014 01:42 AM
Scrodzilla
From: South of Heaven
1005 posts
2 bikes
What a collection of memes you have at your disposal.
JIS ISO into the search bar and the first thing up is....... Sheldon Brown.
http://sheldonbrown.com/bbtaper.html
     
November 5, 2014 01:58 AM
AKfromGC
From: Gold Coast. Australia
179 posts
2 bikes
No, I'm a chef and I make an amazing
[img]/f/49033d6442_1.jpg[/img]
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November 5, 2014 02:04 AM
jamesepoop
From: Orange, CA
47 posts
3 bikes
I have a sugino 75 bb bracket that's compatible for it.
Message me if you're interested
     
November 5, 2014 02:22 AM
outofstep
From: Los Angeles, CA
999 posts
15 bikes
And I found this in 2 minutes as well, which lists the Dura Ace 7600 cranks as ISO

http://shop.parksider.com/?pid=45127361

And here's an example of what I've been finding, people going back and forth on ISO and JIS for these cranks...

http://velospace.org/forums/discussion/...


I see people running Sugino 75 BBs with these 7600 cranks... and Sugino 75s are ISO
     
November 5, 2014 03:25 AM
INFIDEL
37 posts
0 bikes
Honestly it's pretty frickin similar so who cares
     
November 5, 2014 03:27 AM
ridingfixed
From: East Bay, California
356 posts
3 bikes
Sheldon said that. Asian made cranks are generally JIS except older DA and NJS which are ISO.
The taper is the same angle. JIS are further up the taper and ISO is further down the end. They are compatible to a degree. Get the wrong one it may affect your chainline.
Ask a shop that specializes in these sort of cranks. Or Shimano's web site. I've bought from this guy. http://www.alexscycle.com/?currency=USD and he answers your emails within a day. He is in Japan so cut him a bit of slack with response times.
     
November 5, 2014 03:56 AM
AKfromGC
From: Gold Coast. Australia
179 posts
2 bikes
From lgfss, people running ISO are all wider spindle length to compensate for the JIS interface but they don't specify njs or not.

Dura Ace 7600 + Campag Veloce 115.5 + Level (45mm chainline) = M-X
Dura Ace 7600 + Dura Ace 7610 (109mm) + Royce + EAI = wools
Dura Ace 7600 + Campagnolo Pista 111mm + Phil Wood + Phil Wood = maxcrowe
Dura Ace 7600 + UN54 107mm + Miche Primato + Sugino Gigas = Mech_Vandal
Dura Ace 7600 + TA Axix Light + Gran Compe + Condor = photoben
Dura-Ace 7600 + Sugino 75 + Dura Ace + Surly = Dayno
Dura-Ace 7600 + UN54/107mm + Novatec + some shit = Ant
Dura-Ace 7600 + UN54/107mm + BLB hub + EAI - ummar01
Dura-Ace 7600 + Sugino 75 + Dura Ace + Surly = Dayno


https://www.lfgss.com/conversations/198... give that a read too
     
November 5, 2014 09:55 AM
jamesepoop
From: Orange, CA
47 posts
3 bikes
You guys are all fucking crazy.
     
November 5, 2014 03:40 PM
Scrodzilla
From: South of Heaven
1005 posts
2 bikes
     
November 5, 2014 05:25 PM
jamesepoop
From: Orange, CA
47 posts
3 bikes
scrod made me laugh so i looked up his "web-site opinion" because i went through this whole dance before with my own DA 7600 cranks. ISO all day.

I've switched my DA cranks with my sqrl's sugino 75's and never had a problem. Different BB's also, neither of which are Sugino 75 but both are ISO 109mm, and never had a problem.

also it's a bike. I'm sure you can get it to work with other things but it's not how it was a designed, and on a fixed gear, especially if brake-less, i'd prefer that my crank sh!t matches my bottom bracket sh!t. pretty simple if you ask me...
     
November 6, 2014 01:35 AM
pwebb88
From: Bizzzerkeley, CA
506 posts
15 bikes
[quote=jamespoop said:]
Japanese, I'm willing to put my money on JIS. ISO((campy, euro/ital)) is a very small amount of bottom brackets compared to what's available for JIS but that's my experience[/quote]

You'd be losing your money.

In case you hadn't noticed, Sugino 75 and Suntour Superbe are Japanese too. What BB do they both use? 109mm [b]ISO[/b].
     
November 6, 2014 01:55 AM
Scrodzilla
From: South of Heaven
1005 posts
2 bikes
     
November 6, 2014 07:01 AM
riceboy
From: SF Bay Area, CA
342 posts
12 bikes
Ended up ordering a Phil Wood 110.5mm Bottom Bracket in ISO/Campy taper.

How detrimental would it be if I leave the bottom unadjusted and centered? I know the chainline will be .75mm off, will this cause a noticeable difference or more noise?
     
November 6, 2014 10:29 PM
INFIDEL
37 posts
0 bikes
You can offset the Phil BB by up to 5mm as per their instructions.
     
November 6, 2014 11:54 PM
jamesepoop
From: Orange, CA
47 posts
3 bikes
Dude, look at .75mm on a ruler. Do you honestly think it will make a difference?
     
November 7, 2014 12:15 AM
Scrodzilla
From: South of Heaven
1005 posts
2 bikes
oh lawdy

NJS cranks need 109mm [b]ISO bb[/b]. end of story. except for da7710 which uses octalink so obv not compatible with square taper bb. Campagnolo(not njs) pista uses 111mm. these axle measurements are used to achieve the chainline of 42mm which is mostly used.

If you want you can run a JIS bb with those but to achieve 42mm chainline you need a bb with 107mm spindle. also you [i]shouldn't ever use the same cranks again with an ISO bb[/i] as they won't fit properly any more.

Running ISO cranks with JIS bb is only reasonable if you have a top of the line shimano 107mm bb like BB-UN90 or UN91(which I have for sale for 60€+shipping btw) as you probably get tired of this hobby before the bb explodes.

Using a set of shimano UN91([b]JIS[/b]) & NJS cranks like SG75([b]made to use with ISO 109mm bb[/b]) is the most bombproof set you can get. It's unorthodox but who cares if you're not ever going to use the cranks on an ISO BB again.
     
November 7, 2014 01:39 AM
FFF
From: Helsinki, FIN
72 posts
12 bikes
^Great post this is FFF
     
April 8, 2015 06:33 PM
Julle
From: Stockholm, Sweden
1 post
5 bikes
Any 109mm njs bb will work. Thing that matters the most is the drive side honestly. The homie had a DA 7600 road BB at 112mm and flipped spindle. His chainline was proper.
     
May 19, 2015 12:14 AM
jas111
From: Brooklyn, NY
34 posts
7 bikes
*scrod's computer desk*
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May 31, 2015 04:08 AM
stewart13
From: Portland, OR
138 posts
5 bikes
almost inception...
     
May 31, 2015 05:23 AM
pwebb88
From: Bizzzerkeley, CA
506 posts
15 bikes
     
June 2, 2015 05:46 PM
Scrodzilla
From: South of Heaven
1005 posts
2 bikes

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