Mountain Biking - 7 to 9-speed conversion

I'm considering converting my '95 Trek 930 from a 7-speed to a 9-speed. Will a 9-speed cassette fit on the original freewheel hub? Are a 9-speed cassette, chain, crankset, and shifters the only parts I will need to do the conversion? Any advice will be appreciated. Thanks.

It probably won't. Spacing in the rear dropouts for 9speed is 135 while for 7 I think it is 130.

There is no way your 7 speed hub will work with 9 speed. When things changed over to 8 speed they made the freehub body longer to accomadate the extra gear. When things went 9 speed instead of making the freehub body longer they made all the gears and chain narrower and fit them in the same space as the 8 speed cassette. The amount of money its going to cost you to swap all the parts over is going to cost more than the bike is worth. You are looking at $200 parts plus labor at the least. For $450 to $500 you can get a new bike with 9 speed that will do everthing better that your old bike with new parts. Technology changes year to year and by the time 5 or so years go by you are usaually better off with a new bike at this level. Unless you don't mind spending that kind of money and has some kind of attachment to the bike.

If you get a 9spd freehub, just take off your current freehub and swap the new one on. I think it uses like an 8 or 10mm allen wrench. The wheel will need to be redished most likely, but for >$45 you're in buisiness and ready to mount that 9spd cassette.

Oh and since its a 930 steel frame, the legs will spread easily to accept the wider hub body... it will just require a little more force to fit the rear wheel but will spread unlike aluminum.

You can do it, but I agree with DevilDog, by the time you buy all the things you need to upgrade, you're better off with a new bike.

Or, instead of upgrading to 9, downgrade to 1. Go singlespeed with it. One World, One Gear!! Lightens up the bike, less things to go wrong and you resurrect an older bike. Plus, it'll make you a stronger rider!

L8R

You can do it, but I agree with DevilDog, by the time you buy all the things you need to upgrade, you're better off with a new bike.

Or, instead of upgrading to 9, downgrade to 1. Go singlespeed with it. One World, One Gear!! Lightens up the bike, less things to go wrong and you resurrect an older bike. Plus, it'll make you a stronger rider!

L8R

That is a good idea and one I had actually considered as an alternative. Maybe I'll do that instead.

I'm considering converting my '95 Trek 930 from a 7-speed to a 9-speed. Will a 9-speed cassette fit on the original freewheel hub? Are a 9-speed cassette, chain, crankset, and shifters the only parts I will need to do the conversion? Any advice will be appreciated. Thanks.

I recently converted a Trek 930 from 7 to 9, and added a couple of other goodies too. The rear spacing on my 930 was already 135mm. Because of the condition of the wheelset on the bike, I ended up just buying a new set. I have included the link to the thread about my conversion.



http://www.bikeforums.net/showthread.php?t=52508

I recently converted a Trek 930 from 7 to 9, and added a couple of other goodies too. The rear spacing on my 930 was already 135mm. Because of the condition of the wheelset on the bike, I ended up just buying a new set. I have included the link to the thread about my conversion.



http://www.bikeforums.net/showthread.php?t=52508

Thanks for the link. Sounds like it might work. So far the responses have been conflicting. Still toying with the idea of going singlespeed with it though. Thanks again.