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Dura ACe 7400 Hub

Old 01-18-08, 10:58 AM
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steppinthefunk 
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Dura ACe 7400 Hub

Hello,
I recently aquired a nice Cilo with full 6 speed Dura Ace 7400. The bike came with a set of tubular Mavic GP4's laced to Dura ACe hubs. FOr practicality purposes I would like to build a new set of clincher wheels without canibalizing the Mavics.

The question is, DOes anybody know if I NEED a 6 speed Dura Ace 7400 rear hub in order to make this happen? I assume that I cannot go with a 7, 8, or 9 speed rear since I have index shifting but can I fit a 6 speed cassette onto a 7-9 speed hub? or possibly use any other model Dura Hub?...

Thanks for any help.

Jason
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Old 01-18-08, 11:30 AM
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Is the hub take a freewheel or a cassette? Is it 126mm or 130?

Generally, you can interchange 7 and below (126 spread), and 8 and above (130 spread) with a definite split between the two.

That said...7400 series DA gear covered the range of 6-8 speed. Not sure about the specs on the hub.

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Old 01-18-08, 01:55 PM
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Thanks Rad... Didn't expect to get an answer from you on the classics forum... I don't know much about the hub that's oon there right now aside from the fact that it is a 7400 hub...
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Old 01-18-08, 01:57 PM
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I know on the same vintage Deore XT free upbs you can change the hub to taske a 7-speed (and maybe 8) cluster. This is all be required these days as the older six-speed clusters/cogs are very hard to find. Further complicating your effort is that the DA around that time period went to model-specific (and sometimes year specific) indexing whihc whoch means it is compatible with nothing. Hopefully you have a free-wheel hub and can screw-on whatever you want/need.
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Old 01-18-08, 02:49 PM
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If your 7400 hub has a bulbous end on the cog side, it is a freehub that takes cassettes. If it is symmetrical it takes a freewheel.
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Old 01-18-08, 03:52 PM
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Dura Ace 7400 hub

If I understand this correctly, you want to build a new wheel and not tear up the old one. First determine how many spokes are required, 36,32,etc. Buy a vintage 7400 hub on ebay with the correct number of spoke holes. They were either for free wheels, in which the sprockets screwed on to the hub or free hubs in which the gears were slid onto the hub body and tightened down with the outer most sprocket. Dependent on the type of hub you buy, then buy the appropriate cog set. 6 & 7 speed used a 126 rear spacing, 8,9,and 10 use 130 spacing. Does this help? You could go with a 7 speed sprocket set ( it would fit ) but then you would need to buy 7 speed index shifters. All of this stuff is on Ebay if you are patient.
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Old 01-18-08, 03:58 PM
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Originally Posted by Slurpee View Post
If I understand this correctly, you want to build a new wheel and not tear up the old one. First determine how many spokes are required, 36,32,etc. Buy a vintage 7400 hub on ebay with the correct number of spoke holes. They were either for free wheels, in which the sprockets screwed on to the hub or free hubs in which the gears were slid onto the hub body and tightened down with the outer most sprocket. Dependent on the type of hub you buy, then buy the appropriate cog set. 6 & 7 speed used a 126 rear spacing, 8,9,and 10 use 130 spacing. Does this help? You could go with a 7 speed sprocket set ( it would fit ) but then you would need to buy 7 speed index shifters. All of this stuff is on Ebay if you are patient.
Thanks,
That actually helps alot! - I was not aware of the difference between freewheels and freehubs...
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Old 01-18-08, 07:42 PM
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Dura Ace 7400 Hub

Glad that helped. If you want some really good info with pitures showing the different hubs and compatibilities, go to www.sheldonbrown.com and find the tech article re hubs. It is all there and easy to understand when you can see the differences.
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Old 01-18-08, 07:48 PM
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Yeah, the old Dura Ace stuff is a bit complicated. Here's Sheldon's take on it. I just saw someone selling a 6 spd DA hub for cheap around here (Boulder, CO). If you can find one you can probably get it cheap since they aren't really compatible with any modern parts.
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