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Old 06-25-05, 08:14 PM   #1
YellowstoneYeti
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A few drivetrain questions for a touring build

I'm trying to figure out what drivetrain to build my LHT with. I'm thinking of this configuration:

Sugino XD crank with 24/36/48 rings
LX/XT or 105 or Campy Veloce front derailleur
XT or LX rear derailleur
Sram 9 sp cassette-11/32 or 11/34
Sram chain
Campy Veloce 9 sp brifters
Jtec shiftmate

My reasons for picking this combo:

The 24t chainring difference difference gives me more options high and low than a mtb crank or a road crank.

I'm not sure which of the 4 front d's would work best. See ? below.

I like the durability/reliability of the XT or LX rear.

I like the cog combinations better on the SRAM cassettes than Shimano. Campy doesn't make a low enough cassette for my desired gearing.

I think the Campy hoods are more comfortable and I like the fact that the brifters are rebuildable. The shiftmate is obviously to match the campy to the shimano components.


My questions are:

Will one of the front derailleurs handle the 24t chainring difference better than another?

Will the LX or XT take up enough chain for the 24t difference in the chainrings? (if I don't cross-chain it)

Am I asking for a nightmare trying to mix a drivetrain from 4 different manufacturers?

Any other suggestions for a parts mix?

And before anyone suggests it-I don't want barcons!

Thanks!

Yeti
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Old 06-25-05, 11:55 PM   #2
danimal
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my only advice (i'm mid-tour from seattle to los angeles right now-leaving san francisco tomorrow morning), and what i've learned is that YOU CAN'T HAVE TOO LOW OF A GEAR....and i wouldn't really worry about big gears becuase i find myself uncomfortable spinning out a 48-11 on a loaded bike. and besides, usually when conditions allow me to spin a gear like that, my legs are already jelly from climbing all the way up whatever i'm starting to descend that i'd rather relax and let the weight of the bike do the work...sorry i can't help on the 'specific' questions.
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Old 06-26-05, 02:48 AM   #3
CdCf
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My LHT build will have 22-32-48 in front and 11-13-15-17-20-23-26-30-34 rear.
That gives actual gear inches of 15.8 to 106.5 and 15 unique gear combos.
That top gear is just a little over one "gear step" lower than a 53-11 gear on a 700c bike.
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Old 06-26-05, 07:19 AM   #4
YellowstoneYeti
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Quote:
Originally Posted by CdCf
My LHT build will have 22-32-48 in front and 11-13-15-17-20-23-26-30-34 rear.
That gives actual gear inches of 15.8 to 106.5 and 15 unique gear combos.
That top gear is just a little over one "gear step" lower than a 53-11 gear on a 700c bike.
What crank setup do you have that gives you that much range? What front and rear derailleurs are you using?
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Old 06-26-05, 08:04 AM   #5
CdCf
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Note the "will have" in my post...
All parts I don't yet have have been ordered, but the mail order company won't ship until later this week. I expect to have the parts here by Friday or early in the week after that.
My current bike has the same setup, only with a 42 instead of a 48 in front.

The setup is what I wrote in the first line of my post.
22-32-48 front rings and an 11-34 cassette.
XT rear derailer and a simple Deore front der.
Of course, I don't know how the front shifting will be with that 26-tooth difference, but people here have assured me that, although it will be slower, it will still shift, and that's really all I need.

Since my wheels are exactly 24.4 inches, that gives me:

Combo -> gear inches

22-34 -> 15.8
22-30 -> 17.9
22-26 -> 20.6
22-23 -> 23.3
22-20 -> 26.8

32-26 -> 30.0
32-23 -> 33.9
32-20 -> 39.0
32-17 -> 45.9
32-15 -> 52.1

48-20 -> 58.6
48-17 -> 68.9
48-15 -> 78.1
48-13 -> 90.1
48-11 -> 106.5
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Old 06-26-05, 08:19 AM   #6
Bolo Grubb
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I think that gearing set-up, I may try something like that myself
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Old 06-26-05, 09:20 AM   #7
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On my LHT I have the Sugino crank but it is 22-36-46, works fine with Tiagra. And I use SRAM 7 speed cassette (11, 12, 14, 16, 18, 21, 26, 32. ) which I replaced the spacer with another ring so it's now 8 speed, I run XT on that.
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