DaBOB

I've got an old '02 Cannondale Gemini 1000. It needs a bit of work, as I've been sort of ignoring it for a while. I am planning on getting a new set of chainrings, rear cogs, and a chain. Right now I've got three chain rings in front and I was considering the idea of going down to two and installing a bash guard. I've played around with riding on giant rocks in the past and managed to bash up my chainring quite well in the process. I also like to do a bit of downhill (nothing to fancy but I like to go fast) and some freeride. I just thought I'd get all your opinions on this. Does the loss of the third chainring limit your speed too much (I would assume I'd want to keep my low gears). Is it possible to get a bash guard over a third chainring? What else should I consider?

Thanks

dminor 

Yes, you can still get large bash rings that bolt to the outside of your big ring to keep all three. But, really, you won't miss your big ring; replace it with a good poly bash guard.

If you stick to a 32 middle, though, you may find times where you spin out prematurely. This is not so much an issue plunking around on trail rides; but when you start doing more downhill-ish runs at speed, you will find the 32 does not quite cut it.

Easiest solution is to go to a 36t. Remember to get the appropriate-size bash guard for the little-bit-bigger ring.

pOrk

Shouldnt need more then 1 gear, sally

sirtigersalot

the gemini is a pretty heavy bike, idk about the 02 model but later models had up to 7" of travel and weighed over 40lbs, so unless this is gonna be a dedicated freeride/dh bike i'd keep your granny gear, haulin that heavy bike up a hill with nothin but a 36t up front wouldn't be much fun

Cyclist30907654

Whether 'tis nobler in the mind to suffer the slings and arrows of bad gear ratios, or by opposing, add more chainrings.

DaBOB

Bad gear ratios? Two front chainrings wouldn't be so bad would they? I assume I would have to get some sort of new bottom bracket or something to line up the front rings with the rear cogs . Is a "36t" the only chainring you can get in that 32 to 44 range?

What do y'all think about chain tensioners? I was thinking about installing one during this process as well.

P.S.
Forgive me, I'm not very good at Shakespeare just yet.

dminor 

You can choose 34t, 36t or 38t (the most common). I said 36 because that usually satisfies most top-gear needs. I am running a 38t on my downhill bike but, especially paired with an 11-26 cassette, it is less trail-riding-friendly than I would like on a day-to-day basis.

For chain tensioners/guides, there are many more choices out there now for two-ring-shiftable guides than there were even 5 years ago.

ca7erham

There is a bash guard for 3 ring setups, which I've got and use (I would have preferred to just loose my big ring, but I have ridden a good number of places where I appreciated it, like jeep and fire roads out west), but with that bike, I'd just loose the big ring.