Classic & Vintage - 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? ;)

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

Jake

http://www.loosescrews.com/index.cgi?c=Cassette&sc=Complete%20Shimano&tc=8%20Speed&id=653966932518

Any Shimano 8s HyperGlide cassette will work

Caveat: You cannot exceed the rear derailleurs capacity, which I think is 26t (not sure, YMMV, etc).

What gearing are you searching for?

Thanks for all the replies.


What gearing are you searching for?

DVS. I'm pretty open toward gearing, probably looking at a range close to 12-26.

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.

SRAM 12-26 8 spd cassettes are super cheap at most LBS's.

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.

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.

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.

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?

HG50 is a good option.

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.

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?

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.

I know I was just kidding about the MTB. AFAIK, most Shimano short cage RD can handle up to 28t cog.