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cassette questions(4 posts)

cassette questionsmetonymy3
Nov 13, 2001 8:11 PM
I've got a few things I need cleared up here, bear with me...

Where do I get a 8spd cassette for my DA 8spd drivetrain? Dura Ace ok (I've seen them at Parker Int'l, but only in 12-21 and 13-23.) I might go for the 13-23, but does anyone know where to get old 600 cassettes? I've heard good things about the Ultegra 9spd cassettes, that they're just as good but cheaper that DA, and if that holds true for 8spd vintage stuff, I wanna go with 600, if it's available.

Does Shimano still make these old cassettes? I know that they quit with the levers, derailleurs, etc. years ago, but as cassettes (and chains) are consumable, and Shimano has to know that people are going to want new cassettes? Or are all of these sites just selling off old stock?

Also, what cogs were in a 13-23 cassette? Was it just 13 14 15 16 17 19 21 23? What about a 12-23? 12 13 14 15 17 19 21 23? What do I have to do to get an 18, aside from getting 2 cassettes and using half of each, and chunking the other half?

Finally- do all "kit" cogsets come so that starting with the smaller cogs, there is single spacing as far as possible, and then in the bigger cogs, they'll move to double spacing (sooner on 8spd than 9spd)? Or will some cassettes come like say, 12 13 14 15 17 18 19 21 23, so there is a double jump, then back to a single jump, then back to doubles the rest of the way? Am I being clear? I just want to know if I can assume what cogs there are when I see "12-23" printed in a catalogue or something.

Thanks!

Chris
Excel has both DA and 600 8spdDCP
Nov 13, 2001 8:44 PM
Oh, duh.metonymy3
Nov 13, 2001 10:08 PM
Hello! I guess I just assumed that the obvious places wouldn't have them.

Let me add this in- I have a 12-23 right now. If I switch to 13-23 to get a closer ratio, am I going to miss that 12 cog? Or is having the 12 more important. 12-25 is spaced very widely, but you get a 12 and a "bailout". Any opinions?

Chris
Any 8-speed should do...Andy M-S
Nov 14, 2001 3:16 AM
You should be able to use just about anything--DA, Ultegra/600, 105sc--they're all good. DA 8-speed shifters and derailers are unique and must be used together, but the DA cassettes have the same spacing as all the other Shimano cassettes. As for cog spacing:

I'm also an 8-speed type. When I started out, I used a 12-25 cassette because I was worried about my legs. more recently, I've used 12-23 and 12-21. I find the closer spacing to be better for my riding (mainly flat to rolling, with the occasional 600'/mile climb).

I should note that at almost 200#, I find that I don't like spinning, and that I tend to grind (seems to be true for lots of us big guys). Given that, 12-13-14-15-16-17-19-21 is about optimal. If things look bad, I lose the 16 (too bad!) and gain a 23. I will be persuaded to go to 10-speed on the day I can (a) afford it, and (b) find a 12-21 straight block...

The 12 is a nice gear to have if you like high-speed descents. The back side of the climb I mentioned earlier is smooth, straight, and fast, and I've done 51 MPH on the way down. To have *any* sort of control on that downside, the 12 is a must for me. OTOH, if you don't do a lot of very fast descents, the 13-23 is likely to feel a lot better for your legs.