Curious: anything I have to look out for?
Curious: anything I have to look out for?
Look out for more comfortable gear ratios...A triple makes the front derailleur capable of so much more help to the legs.
New bike. The compact double is a lot less convenient than I'd imagined. I end up cross-chaining a TON.
I figure when the time comes to replace the front crank, which should come in two years time, I'll do it then.
If upgrading, you'll need a longer cage RD and either an FD for a triple and/or the need to raise the FD
a tad higher on seat tube. Your left shifter/brifter will need to be swapped out for one that can shift thru
3 chainrings; may need new shifter cable.
Some triple crank owners I know like to have those chain guide catchers on their seat tube.
I ride a 50/34 compact crank w/12-27 cassette. Previous bike was a triple.
Also, I cross-chain like crazy...
My problem could be alleviated to a large extent I suspect by a rear cassette which overall had larger cogs.
I looked up the specs of my bike and apparently I have a 12-26 Sram 950 for the rear cassette.
Suggestions for something with slightly lower gearing? Is it possible to fit a mtb cassette like the hg50 onto it?
On my triple, a 53/39/30, I have a 12-27 cassette. I RARELY get off the 39 ring, in fact wore it out after 15000 miles! Even moderate hills were no problem with 39/27 combo. When I go to the real hill counrty I do use the 30 for up, and the 53 for down hills. I think the 12-26 will be fine for even fairly steep hills. If not you can always get a Shimano 12/27, or the new 11/28. I also have a 50/34 compact on my other bike with a 12-27 cassette, and rarely get out of the 50, so I also crosschain A LOT.
Last edited by Halfast; 11-23-09 at 12:19 AM.
"The object of life is not to be on the side of the majority, but to escape finding oneself in the ranks of the insane."
When I was buying that bike, I used Sheldon Brown's gear ratio calculator to compare a compact vs. triple (assuming the same cassette), and I really only gave up a couple of lower gear ratios by going with the compact. IMHO, worth it to have a simpler FD to maintain...I hate having to adjust the FD on my hybrid (which has a triple).
Thoughts on replacing the 9 speed with say, an 8 or 7 speed? I don't get the purpose of the 9speed, honestly. I usually end up shifting two gears at a time, and it seems that the only difference between the 9 and the 8 is that the 9 has a 12-13-15 while the 8 has 12-15
heck, this 6 speed may beall i need
I changed my Fantom CX to a triple with a 11-34 cassette for some touring and winter riding (needed high cadence in cold weather due to knee and back issues).
IIRC, I needed to switch the rear derailleur to a long cage model. I used a deore rd. I also changed the fd to a triple and bought a new chain.
Last edited by rogerstg; 11-24-09 at 08:35 AM. Reason: clarify
FWIW, if I lived out west and climbed a lot of mountains, a compact would probably work out great. With the constant up and down where I live, it would be a hassle. A compact will also never offer the range or tight gear spacing that you can get with a triple.
If you make the switch, you might need to tighten the B-screw (or screw it in from the back) to get more clearance between the biggest cog and the jockey pulley. It's counterintuitive, but when switching to a larger cog you can sometimes use a shorter chain to pull the jockey further away from the cog. If your chain is currently longer than necessary, you could shorten it.
That being said, going to a bigger cassette might not help that much with cross-chaining when you are on the smaller chainring. Tooth counts at the high end of the cassette are typically the same across road and MTB cassettes (11 or 12 teeth). The change will mostly be at the bigger-toothed cogs on the cassette, which will make the middle cogs more usable with the bigger chainring. That's not so helpful if you're riding in a city, with frequent starts and stops. Perhaps another solution is to use a small chainring with more teeth (say, 38t if you're currently using a 36t).
FWIW, I explored the same options when I started riding my Surly Cross Check. I didn't yet appreciate the close 12-25 cog spacing and uphills were killing me (a probable case of swine flu didn't help). I emailed Surly to ask about changing to a triple, but they very politely suggested that I HTFU instead. They were right, and now I'm very much enjoying the stock setup. So maybe you should try things out for a while before buying a ton of replacements.
So in conclusion, the answer is no, since I'm not keen on replacing derailleurs.
Weirdly, I also haven't been able to find many 48t/36t front cranks.
Your instinct to change to a triple is the right one. When you need wide gearing, it is the nature of a compact to cross-chain. There's just no way around it.
Unfortunately the conversion is not an easy one. You'll need the crankset, probably a FD, possibly a right shifter, and possibly a RD. (You still haven't told us enough about your components to be able to say for sure.)
Changing RDs isn't a big issue, btw.
Stupidity got us into this mess - why can't it get us out?
- Will Rogers