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What cassette for Trek 930

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What cassette for Trek 930

Old 05-15-11, 08:54 PM
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What cassette for Trek 930

I have a 1996 Trek 930. I just replaced the chain and sprockets and when I rode it; it now skips on the 5th gear. I figured I needed to replace the cassette and crank but the guy at the local bike shop said I didn't need to before I replaced the chain. The original cassette is a IG60 11-28 7spd. I've seen these HG cassettes and wondered if I could put one of these on. I'd like to get something a little better than the original if that is possible before I decide to throw down on a whole new bike. If not then I will replace with the original rear cog. BTW the replacement chain is a SRAM PC 830. Thanks for any help.

So here's the bike specs:

Component Group Shimano STX
Brakeset Shimano Alivio M-System brakes, Chang Star 274AG levers
Shift Levers Grip Shift SRT-400
Front Derailleur Shimano STX top-swing, top-pull/clamp-on 31.8 mm
Rear Derailleur Shimano STX
Crankset Shimano STX, 22/32/42 teeth
Pedals System 1 w/clips & straps
Bottom Bracket Shimano BB-LP26, 110 mm spindle
BB Shell Width 73mm English
Rear Cogs 7-speed, 11 - 28 teeth
Chain KMC IG-31, 1/2 x 3/32"
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Old 05-15-11, 08:58 PM
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if it's skipping a gear then that sounds more like a derailleur adjustment than the need to replace the cassette entirely. if you want or feel like you need a new cassette, then by all means go ahead, but without adjusting the derailleur correctly you'll probably still skip gears.
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Old 05-15-11, 09:29 PM
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Originally Posted by ejet
chain and sprockets ... cassette and crank ... didn't need to
I'm a little confused. OK, you replaced the chain. You're asking about the cassette so you didn't replace it. But did you also replace the chainrings?

Originally Posted by ejet
The original cassette is a IG60 11-28 7spd. BTW the replacement chain is a SRAM PC 830.
Since you went with the SRAM chain, I'll suggest the SRAM 7 speed cassette. There is only one choice and it is a 12-32 PG-730. You may need to lengthen the chain 1 inch if you shortened the new chain to the minimum for the 11-28 cassette.
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Old 05-16-11, 03:33 PM
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I don't think it is an issue with the derailleur(sp). It shifts into all the gears fine but on the 5th and sometimes 6th it will slip when you pedal hard or not even that hard at all when your already in the gear. I replaced the chain and sprockets; don't know how much more clear I can be. The cassette and crank are original.

So what I need to know is what cassette to get that is possibly an upgrade if that's even possible? Also should I get a new crank as well or is this all going to be too expensive? Thanks
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Old 05-16-11, 04:34 PM
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Originally Posted by ejet
I replaced the chain and sprockets; don't know how much more clear I can be. The cassette and crank are original.
The term "sprocket" isn't clear. It could mean the cassette cogs in back, or the crank chainrings up front. Or maybe even the derailleur pulleys. I really don't think you succeeded in changing the long discontinued chainrings on an STX crank.

Originally Posted by ejet
So what I need to know is what cassette to get that is possibly an upgrade if that's even possible?
If the new chain is skipping in certain gears, then your cassette is likely worn.

Your cassette choices:

SRAM PG-730 chrome plated 12-32
Shimano HG50 painted black 13-26, 12-28, 13-30, 14-32, 13-34, or 13-28
And there's a small chance you can still get a Shimano HG70 chrome 11-28
Shimano HG30 (entry level) 11-28

Last edited by laura*; 05-17-11 at 10:06 AM. Reason: Added HG30
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Old 05-17-11, 05:14 PM
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Ok that helps a lot. I'm sorry; "sprockets" is what the bike store employee called em. The two little pulleys that direct the chain beneath the cassette is what I'm referring to. Those have been replaced. So any of those above will work. As far as the gearing goes is there a good thread to understand how those correlate? Thanks
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Old 05-17-11, 05:32 PM
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Look at the Stickys, and check out Sheldon Browns site for all the info you will ever need
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Old 05-17-11, 06:59 PM
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Jenson has the PG 730 for $19. The 32t will make it easier for you on the hills.
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Old 05-18-11, 07:06 PM
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Ok I will probably get the PG 730 cassette. So no one makes replacement chain rings for the Shimano STX? So what do I have to do; buy a whole new crank? Which crank would make a nice replacement? I'm looking at the SRAM chains and the one the bike store put on there (PC830) is the crappiest one. That might have to change too.
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Old 05-18-11, 11:52 PM
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Originally Posted by ejet
So what do I have to do; buy a whole new crank?
Yup. That's often cheaper anyway even when replacement chainrings are available. You might also need to buy a new/different bottom bracket.
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Old 05-19-11, 07:28 AM
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Chain and cassettes wear together. If the gear that you use most is probably what you are calling 5th, that will be the one with the most wear. The new chain will not mesh correctly as the wear pattern is not the same. Get a new cassette and it should be fine.
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Old 05-19-11, 11:28 AM
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It does sound like a worn cassette. Often you can go through a few chains before wearing out the cassette cogs if you change the chain early enough - before it wears the teeth too much.
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Old 05-19-11, 06:13 PM
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Does this look like a good combo? https://www.jensonusa.com/store/basket.aspx I guess I'd need the Park Tool for taking the crank off. Anything else you think I'd need? Thanks
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Old 05-20-11, 01:24 AM
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Originally Posted by ejet
/store/basket.aspx
We can't see inside your shopping basket...
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Old 05-20-11, 07:06 PM
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Lol. Ok here we go

Cassette: https://www.jensonusa.com/store/produ...+Cassette.aspx
Crank: https://www.jensonusa.com/store/produ...+Crankset.aspx

Thanks for all your help!
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Old 05-20-11, 07:41 PM
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Originally Posted by ejet
Lol. Ok here we go

Sram PG730
Shimano DeoreLX FC-M582
The crank is overkill for your bike, but at clearance pricing that's a good choice.

You'll need two sets of tools: A square taper crank puller and a cartridge BB socket to remove the old parts. And an outboard BB wrench and a Shimano 2-piece crank adjuster to install the new parts.

Is there a particular reason you think your crank/chainrings are worn out?
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Old 05-24-11, 03:48 PM
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Cuz they're the original and some of the chainrings look worn. You say its overkill; so maybe I should just do the cassette then?
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Old 05-24-11, 04:59 PM
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Originally Posted by ejet
Cuz they're the original and some of the chainrings look worn.
Don't confuse chainring wear with the ramping, pinning, contouring, shortened teeth, and other shifting helpers.

You said that the "5th" gear was skipping. If you mean the one where the indicator said "5", then that is a 15 tooth cassette cog. Thus, your favorite riding gear is probably 32x15, or maybe 42x15. That means that the wear is spread out across twice or even three times as many crank chainring teeth as teeth on the cassette cog. (Of course though, the 32x18 and 32x13 ratios also put wear on the 32 tooth chainring...) This generally means that cassettes wear out faster than cranks.

Originally Posted by ejet
You say its overkill; so maybe I should just do the cassette then?
I say it is overkill because it is such a huge jump in quality and technology.

I'd suggest replacing just the cassette for now. See if that fixes the problem. Save your money to "throw down on a whole new bike". The Trek could become your backup bike. Or, if you like the Trek, you could "throw down" on a whole new component group.
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Old 05-24-11, 05:09 PM
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+1 Do the cassette only first. I often have to replace worn cassettes that skip gears, I rarely have to replace cranks.
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Old 05-24-11, 05:49 PM
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The LX crank is a beauty at that price,
But the chainrings and right arm are already attached to the Bottom Bracket Spindle (or axle)
Quote from description on web catalogue: "Shimano LX FC-M582 Crankset w/BB

The 2-piece crankset construction with integrated bottom bracket..."

This crank / BB combined piece requires special external bearings for the BB.

So it is the wrong crank. You want one that attaches to a square-tapered BB which your bike will have.
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Old 05-24-11, 10:13 PM
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The LX crank would fit, once the original square taper bottom bracket is removed. But as WK101 states above, it would be reasonable to try replacing the cassette first, as the chainrings don't wear as quickly as the smaller cogs on the cassette.
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Old 05-25-11, 06:12 PM
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Alright its settled then. Ordering the cassette and I will see how that works out for me and in the future I could get a crank. $80 seems very reasonable for a whole new crank and I'm new to this. Oh and I do want to buy a new bike sometime but apparently I shouldn't say throw down on one. lol
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Old 05-25-11, 06:13 PM
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Thanks for all the help. I really appreciate it!
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Old 05-26-11, 06:58 AM
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That is a very nice crank and bottom bracket for the $. Tempted to get one myself. Surely I'll need it someday....
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