Jan 28, 2003 8:03 PM
|I am want to change the gearing on my 2002 Gary Fisher Mamba from the stock 42/38/28 7-speed 13-30 rear; to something more usable for touring. What gears would get me more road speed but still have low enough gears for hills? I plan to put racks, fenders, and something close to road tires on it (tires good for pavement/dirt/gravel).|
|re: Touring Gears||rwbadley|
Jan 28, 2003 9:59 PM
|Not knowing how strong you are, what area (re: hills) or what loads you plan on carrying, its hard to make a judgement.
Your current gears sound a little low, but not too far off. You could keep the front 'rings and go to a 12-26 rear. Or swap the front rings to something like a 32-40-48 and keep the rear cogs. Or if it is all worn out and you want to start fresh, get a new driveline with front and rear.
|re: Touring Gears||pa rider|
Jan 29, 2003 3:51 AM
|Hi Lexington476. I have some personal friends who tour across county the pass three years. I asked the older gentleman the same question as yourself (they are retired and can take a year to do a tour).
Based off his recommendations you could go lower on the front chainrings. He had a 100lb tour loaded bike and said he could have left the big chainring home (40's). A 26 granny worked for him, but he said he may put 24th on for his wife's bike. He said he nevered even got out of the granny on some days.
If your planning on use the bike as a road bike, only tour maybe twice a year then RW recommendations would work. My friend uses the mtb crank setup for his trek touring bike (46,36,26).
We did have one couple do the continental parmeter two years ago (12,000 miles). All the tour riders here in harrisburg pennsylvania bike club said to use the continential touring tires. They never got any flats and they only had to buy two tires for the whole tour.
I don't think I could push a 100 pound loaded tour bike up beartooth pass. I'll save that for my golden years.
Good luck on your touring.
|re:Get a bigger big ring - 48 or so.||dzrider|
Jan 29, 2003 5:31 AM
|With thinner tires and a load it's pretty easy to spin out on the down hills and it's good to be able to start meaningful pedaling at a reasonable cadence before you've lost too much speed.
Judging by the the closeness of the big and middle ring and the range of the free-wheel you have half-step gearing and may want to change that as well. I don't know how well you climb or how fast you spin while climbing, but a 12-26 or 12-28 would likely be enough.
|re: Touring Gears||Jusme|
Jan 29, 2003 6:14 AM
|Harris cyclery has a Sugino 28/38/48 crankset. You could use that with a MTB 11-32 or 34 cassette. 48 x 11 top and 28 X 34 low should cover you.|
|My touring bike has:||Alexx|
Jan 29, 2003 6:38 AM
|My old C'Dale super-heavy-duty tourer usually runs a 13-28 rear, or even a 14-30, if I'm expecting lotsa hills with lotsa gear. For the rings, I've found that a 52-48-32 "half step + granny" setup works well for me, allowing me to split every gear in the higher range, while still allowing low climbing gears. I have in the past run a 54 tooth big ring, but finally came to my senses.|
|I'd just replace cass||cyclopathic|
Jan 29, 2003 6:50 AM
|with 11x28. 48t big ring is another option..|
|re: Touring Gears||Heron Todd|
Jan 29, 2003 8:21 AM
|It really depends on the gear and terrain. Remember that many who do fully-loaded touring will run a 20 or 22T chainring with a 32 or 34T cog. If your large chainring is really a 42 (doesn't sound right for stock if the other 2 'rings are 38 and 28), you might want to go a bit bigger, but you can also go with an 11T as part of an 11-32 or 11-34 cassette.
Tullio's Big Dog Cyclery
LaSalle, IL 815-223-1776
|re: Touring Gears||lexington476|
Jan 29, 2003 4:23 PM
|This is cool! I live and plan to use this bike in Michigan, USA. It is more or less flat here, but some parts of the state do have some hills. After taking another look at the G/F catalog I put in the wrong gears. This is the correct gears: 48/38/28 7-speedd 13-30 (this is from the catalog, I did not go and count teeth), the Mamba is a $300 hard tail mountain bike. I am getting a real ($1000) MTB, and want to convert this one for touring. I am a little lost on some of the terms, what is half-step gearing, and granny gear (and how do I know if I have them)? I want to try to get away with out having to refit the whole drive train on this bike and gear shifters on this thing (it is only a $300 bike after all). If I replace the real cassette would I need to replace the shifters, derailleur, wheel parts, etc (same question for the front chain rings)???? The current drive train is in fairly good shape, I am in fairly good shape my self and in my late 20s (I plan to race MTBs this year). I think the loads I will carry will be for weekend trips and such nothing to bike (yet). I want to get this thing to go faster on the road. One time I rode it to the mall and was only doing 12 mph (that was with off-road tires though). Also, how does the rear gearing work more teeth more speed of the other way around (same for front)?|| |