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Old 07-27-10, 02:27 PM   #1
Diesehrl
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Dura Ace 8 spd cassette?

Well, a bike equipped with full Dura Ace 7400 kinda fell into my lap. It has 8 spd indexed shifting, and the hub is compatible with the HyperGlide system. Is there anywhere you guys would recommend I start my search, outside of Ebay? Any other cassettes I can use? Anyone willing to sell one?
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Old 07-27-10, 02:39 PM   #2
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If it is Hyperglide any Shimano or 8 speed Sram Cassette will work. A WTB on your local craigslist could yield good results. Or here in the ISO thread

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Old 07-27-10, 02:51 PM   #3
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http://www.loosescrews.com/index.cgi...d=653966932518
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Old 07-27-10, 02:55 PM   #4
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Any Shimano 8s HyperGlide cassette will work
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Old 07-27-10, 03:07 PM   #5
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Caveat: You cannot exceed the rear derailleurs capacity, which I think is 26t (not sure, YMMV, etc).
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Old 07-27-10, 03:34 PM   #6
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What gearing are you searching for?
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Old 07-27-10, 03:44 PM   #7
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Thanks for all the replies.

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What gearing are you searching for?
DVS. I'm pretty open toward gearing, probably looking at a range close to 12-26.
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Old 07-27-10, 03:46 PM   #8
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12-26 will be fine. Some of the real light ones don't wear as well, but there are lots of cassettes out there, new and used.
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Old 07-27-10, 04:03 PM   #9
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SRAM 12-26 8 spd cassettes are super cheap at most LBS's.
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Old 07-27-10, 04:16 PM   #10
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I run a shimano HG 12-26 8speed on my dura-ace paramount, it works great! Not my primary bike, but the set up (cassette and chain) is still going strong after several years.
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Old 07-27-10, 05:38 PM   #11
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I am running a Sram PG-850 cassette with my Dura Ace setup. It is inexpensive, shifts great, and pretty light weight for the price.
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Old 07-27-10, 08:50 PM   #12
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Quote:
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Not to forget that a "26 tooth capacity" rear derailleur is the total of the amount of tooth difference between the big and small sprockets front and rear.
so a 12-26 uses 14 teeth of capacity. which would allow 12, or a 52-40 spread max on the front.

Though some times it can be difficult to clear a big rear with the guiding jockey pulley of a short cage derailleur.

What you described there is "Max Chain Wrap". The "Max Cog Capacity" for the 8 speed RD-7402 is 26 teeth. The Max Chain Wrap is also 26 teeth listed by Velobase. I have no problem running a 28 teeth max chain wrap with my RD-7402. It shifts very smooth and positive.
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Old 07-28-10, 07:06 AM   #13
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As much as I would like to keep the Dura Ace group consistent, would you guys recommend the SRAM PG-850 or the Shimano HG-50. Are there any differences, besides possibly weight?
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Old 07-28-10, 08:28 AM   #14
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HG50 is a good option.
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Old 07-28-10, 09:26 AM   #15
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Quote:
Originally Posted by abarth View Post
What you described there is "Max Chain Wrap". The "Max Cog Capacity" for the 8 speed RD-7402 is 26 teeth. The Max Chain Wrap is also 26 teeth listed by Velobase. I have no problem running a 28 teeth max chain wrap with my RD-7402. It shifts very smooth and positive.
I ran a cassette with a 32 tooth large cog for a weekend tour with my 7402 drivetrain - everything worked well up to the 32. In the 32 the pulley wheel and the cog would rub together. I seem to remember everything was fine one gear down so you could possibly run a 28 if you so want some really low gears.
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Old 07-28-10, 09:56 AM   #16
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Originally Posted by tashi View Post
I ran a cassette with a 32 tooth large cog for a weekend tour with my 7402 drivetrain - everything worked well up to the 32. In the 32 the pulley wheel and the cog would rub together. I seem to remember everything was fine one gear down so you could possibly run a 28 if you so want some really low gears.
Good to know. I wonder if you can shim under the b adjustment screw to make the 7402 works with 32 cogs. It will be cool to run 7402 on a mountain bike! What chain rings are you running up front?
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Old 07-28-10, 10:05 AM   #17
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That was with a 39/53 front ring combo. I'm not sure if the chainring size factors into the cog capacity issue. I tend to just try stuff first, then research if things don't work out

Note I said should work. These cogs are way out of the range that the d is designed for, so it may take some mojo to get working.

I think a 7402 on a mountain bike would be pretty hot, but there are two things I can think of to look out for: 1. 7402 requires 7402 shifters; you may be able to use Sheldon's "alternate cable routing" and normal 8-speed shifters. 2. You really don't have much chain wrap with a super short cage d and big cogs - I can't think of a fix for this, just be prepared for some difficulties.

It sure would look good though, I love the strong, industrial looks of 7400 stuff. My fave by far.
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Old 07-28-10, 10:26 AM   #18
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I know I was just kidding about the MTB. AFAIK, most Shimano short cage RD can handle up to 28t cog.
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