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Old 03-13-06, 04:56 PM   #1
GeorgerinNH
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gearing for touring

i bought a trek 1000 and i want to change the rear gear once i got my trailer on there and some weight i dont have a low enough gears any suggestion on a set for the back thanks
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Old 03-14-06, 12:34 AM   #2
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i dont know what a trek 1000 is but basically you're better off with a 32 or 34 tooth on the end of your cassette. if this is a road bike you may also be better off with a mtb crank as well, since road bike cranks tend to be very tall geared. you rarely use a 52t chainring for trips where you average 10-12 mph.
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Old 03-14-06, 07:08 AM   #3
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seeker333 has it right. I put a 26\36\46 mountain crank and a 34 cassette on my LHT and I haul a BoB around. My gear inches are 20 to 100 which is perfect for me. I can climb hills easily and still crank downhill faster than I need to go. Even with road chainrings, you'll be happier with a 32 or 34 cassette.
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Old 03-14-06, 09:11 AM   #4
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I believe trek 1000 is a sora equipped road bike. If that's the case you need an 8-sp cassette and compatible mtn derailleur. If you have a 30-42-52 triple, you can probably get buy with just a change of cassette/rear derailleur unless you have lots of mountains. I suggest you start with a deore rear derailleur ($30 or so) and an 11-34 8sp cassette (also $30 or so). If that doesn't give you low enough gearing, try new chainrings before getting a whole new crankset. I have a road crank with 28-39-50 with 11-32 cassette that works pretty darn well for me. I don't have many long climbs, but there are several that are close to a mile long with grades between 10 & 15% that still challenge my legs with a 30 lb munchkin in a 20 lb trailer behind me.

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Old 03-14-06, 09:33 AM   #5
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I put a Deore 44-32-22 crank and SRAM 12-34 cassette on my Trek 7500FX and it was the only way I could have made it through the Rockies last year.

Adding 50-60 lbs to your bike will change anyone's opinion about the value of low gearing.
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Old 03-14-06, 02:33 PM   #6
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if i get a 10 speed casesste do i need a need derailer also?
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Old 03-14-06, 03:30 PM   #7
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Quote:
Originally Posted by GeorgerinNH
if i get a 10 speed casesste do i need a need derailer also?
IF you have Sora brifters, use of a 10 speed cassette means a serious outlay of money. It also means not getting a cog larger than probably 27 (29 if you go campy).

Let me explain:
The shifter determine cable pull. Cable pull determines how much the derailleur moves. Indexed shifters are set to pull exactly as much cable as necessary to move the derailleur a distance that corresponds to the spacing on the cassette. If you try to use mismatched shifter/derailleur or cassette, you will not be happy.

Going back to your question...if you get a 10 speed cassette($65+), you will need to get a new 105 or better long cage derailleur (to go with your triple up front) ($50 on up). You will also need to purchase a set of 10 speed brifters, and potentially new cables ($200+). After shelling out all that money you will have the exact same gearing range you have right now, with the lowest possible gear of 30-27.

If you want more low gear for hills/loads, you need an 8 or 9 speed system (to match the currently available mountain cogs). For 8 speed (which sora is) all you need is a new derailleur (to handle wider gearing range) and a new cassette (again I recommend 11-34). You might need a new chain but if you avoid big-big it won't be a problem.

For a 9-sp system, you will need the above PLUS new shifters, you WILL need a new chain (9-sp chain instead of an 8-sp chain) and you might need new cables.

I would discourage you from investing in all the 9-sp stuff because by the time you are done you will have spent almost as much as your bike cost initially. Just spend $60 and get a new Deore derailleur and an 8-sp cassette. If you need more gear, then change the cranks. More speeds don't really improve your gearing range, they just reduce the size of the steps you take to get there.
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Old 03-14-06, 06:44 PM   #8
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i concur wth dogboy's suggestion about just swapping your rear cluster with something that goes up to around 32 or 34. most likely, you'll need a new chain (unless you've got 6 or so links around) and the rear derailleur too. but i'd try out your current derailleur first if it's got a fairly long cage. it may squeak by
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Old 03-14-06, 09:02 PM   #9
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In addition to adding a 32 or 34 (low gear) cassette, I would add a 24 tooth inner chaining on your crankset. This arrangement has work wonderfully for me on my Surley LHT's Ultergra Crankset. I've also added a chain watcher to keep the chain from over shifting as well.
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Old 03-16-06, 06:59 PM   #10
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This is fascinating, and timely, as I am thinking about gears -- specifically: how to add more low ones! I have a Biopace 28-38-48 chainset and a 7-speed 12-28 cassette. I was thinking of swapping the crank but now I think I will simply swap the cassette. There is an 11-34 7-speed available for peanuts.

I just fitted a new chain. Will I need to replace it for a longer one?

Last edited by Lolly Pop; 03-17-06 at 05:37 AM.
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Old 03-19-06, 08:28 PM   #11
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I changed to 14-34t w/ the 48/38/28 front crank which works good for my 7 speed tourer, though the last jump is a pretty big one.
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Old 03-19-06, 10:02 PM   #12
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I have a FSA 53-39-24 triple set up with 12-34 cassette cog; I can go up most hills fully loaded and not a problem. It also allows for a feeling of extra high gears for when you really need it the most.
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