Jdubstheman

I have a 2001 Lemond with a rear cassette CS-7700 that I believe needs replacing. Obviously can’t find a new one of these. Is there a good new replacement I could use without changing my other components?

Any help would really be appreciated!

t2p

a number of CS7700 cassettes are currently listed on eBay - including a few new

but don't know if they are the exact cassette you are looking for

a 9 spd Ultegra cassette should also work ... possibly 9 spd XT cassette also

there are some other Shimano compatible replacements that I'm not familiar with ... ? ... Sunrace ? ... Miche ? ...

don't forget to also get a new chain

csport

Any Shimano compatible 9 speed cassette - Shimano, SRAM, Sunrace, Microshift, IRD, ...

If the largest cog is not bigger than what you have now you should be good, otherwise you may need a longer chain.

OTOH it is a good idea to install a new chain with a new cassette, then you can size the new chain correctly. You will need to check that the RD can handle it (chain wrap capacity and the largest cog).

Bill Kapaun

Largest cog is rated @ 27T You "might" be able to exceed that by a couple teeth??

jimc101

What ratios do you currently have? Getting a 9-speed cassette with just about any ratio should be easy, but not at Dura Ace level, as long as you can take a lower spec, it should be easy to find

Jdubstheman

Thank you all for this information. Very helpful. I have a 12-23 cog and also did just put on a new chain. I will check out the eBay suggestions and others. Thank you again!

smd4

I got two NOS Dura Ace 7700 cassettes from eBay within the last year. They're definitely available, sometimes even for a good price. 12-23 and 12-25.

Jdubstheman

What does NOS mean and are they used or new? How much would you expect to pay? Thank you.

smd4

"NOS" means "New Old Stock." A new item, usually in the box, never used, that's been sitting on a shelf somewhere or in someone's closet.

FWIW, I paid $100 for my 12-23 and $157 for my 12-25.

You can filter eBay to show only "sold items," which should give you an idea of what other similar items are selling for.

Jdubstheman

makes sense and thank you!

veganbikes

Probably would just buy a 9 speed cassette in the right ratio? Nothing special about the Dura Ace Cassette or chain other than maybe being lighter or having a bit more titanium cogs loads of cassettes on the market you just need to match what you have and make sure it is s-group compatible.

smd4

Sure, you’ll pay a premium for DA. But that “lightness” and “more titanium” is worth every penny for many of us! It is in fact what does make DA “special.”

veganbikes

Sure but in terms of a cassette it is another cassette so long as the ratios are correct. Yes Dura-Ace is the top of the line for Shimano and really great stuff but in the context of the question being asked it is just a cassette.

Jdubstheman

Thanks all again. By replacing my chain (was confirmed stretched by my Park measuring tool) with a new Shimano chain my shifting is actually back to perfect! No new cassette required! However I am toying with taking the cassette up to a 12-30. Is that doable within the specs of the 7700 group I have?

HillRider

As noted above, the maximum Shimano speced cog is 27T but Shimano is pretty conservative with specifications their so going to 30T may work but there is no guarantee it will. You will probably have to adjust the "B-screw" to clear the largest cog and are likely to need to add a few chain links if going from a 23T largest cog.

Also, any Shimano or Shimano compatible 9-speed cassette will work. Shimano Dura Ace, Ultegra, 105, Tiagra, and SRAM 9-speed will all be fine

Classtime 

I use a 28 tooth large cog cassette on my 7700 bike no problem.

edit: more info— 53/39 Cranks.

70sSanO

As others have indicated, yes, no, but most likely maybe. If you have an SS RD your max cog is 27t and your max wrap is 29T.

Going to a 30t is dependent on the derailleur hanger and the B screw. Some bikes will allow a push to 30t and some won't.

If you go with a 12-30 and have a 52/42, or other 10t difference crank, you will have a chain wrap of 28t and will be within the RD's max of 29t. If you are running a 53/39 crankset, you might ("probably") be able to push it to 32t chain wrap.

John

dedhed

https://www.modernbike.com/sram-pg-9...12-23-cassette

​​​​​​Shimano cassettes - South Salem Cycleworks

​​​​​​https://www.greenmountainbikes.com/p...2-23-cassette/

maddog34

Chains don't "stretch", they Wear, at the pin/bushing interfaces.

And your Derailleur probably won't work with a 30 t 1st gear cassette. Is the Der. a "short cage"? if so, a 27 is just about max. The front Chainring combo info will also be required for anyone to make the call for you here...

smd4

You’re allowed to say your chain stretched. We (well, most of us) know what you mean. You can also call a sprocket a cog, or call a seat a saddle, or a saddle a seat.