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I'm in the process of making the same decisions. I'll probably go with buying a new touring bike vs keeping what I have. I had a 48 hole rear wheel built a couple of months ago that I'll transfer over to a new bike when I get it. depending on how much gear you'll be hauling you may want to consider more than 36 holes. Here's a link to an article that I found helpful.... As well Sheldon Brown has a lot of useful info. I think there's a link in the article.http://www.sentient-entity.toucansurf.com/touring_wheels.html
This is really good info...but I think by the time I swap out all these parts, I will have essentially paid for an entry-level (or used) touring bike, and ruined a really good road bike in the process.
It seems like a dedicated touring bike is certainly the way to go here.
I think that the shimano road derailleurs are speced to handle a max of 27 teeth on the cassette. That is a bit of a conservative estimate and they actually work with 28t, but not more. Above 28t your derailleur pulleys will rub on the cassette. You can use a LX, XT, or XTR derailleur to handle a larger cassette and they will shift perfectly with the dura-ace sti.
You could also get a smaller-ringed crank (that's what i did to solve a similiar issue before a tour on my cross bike), like 42-32-22. That way you can use a more tightly spaced cassette like 11-28 and still have good hill climbing gears. You'll spin out of 42-11 on big descents, but at 35mph you'll probably be coasting anyways...
Thanks for all the good input!!!
Here's a couple of things to add about my current setup:
I have a Dura Ace 7800 triple drivetrain...so it's a 10-speed cassette in the rear (which tend to be geared more for racing than for hauling). The biggest 10-speed cassette I've found is a 12-27 tooth. Combined with the triple ring in front, that may give me adequate low gears for climbing...but true touring bikes seem to have 34t cogs in the back.
With fenders, my frame is supposed to take on 700x28c tires. Without, I think it can take 700x32c (but I would rather keep the fenders).
Axiom and Jandd make low rider racks that I can clamp onto my forks (my forks lack eyelets). I already own a rear rack that I clamp on to the rear triangle.
And yes, I have been considering a high-spoke-count wheelset for general purpose use, saving my fancy wheelset for centuries and training rides.
For now, I think I am likely to go with Salvo's advice...try a few shorter trips with the setup I have and see if it works.
I think that the shimano road derailleurs are speced to handle a max of 27 teeth on the cassette. That is a bit of a conservative estimate and they actually work with 28t, but not more. Above 28t your derailleur pulleys will rub on the cassette. You can use a LX, XT, or XTR derailleur to handle a larger cassette and they will shift perfectly with the dura-ace sti.
You could also get a smaller-ringed crank (that's what i did to solve a similiar issue before a tour on my cross bike), like 42-32-22. That way you can use a more tightly spaced cassette like 11-28 and still have good hill climbing gears. You'll spin out of 42-11 on big descents, but at 35mph you'll probably be coasting anyways...
Our Co-Motion Speedster tandem has triple front (54-42-30) and a rear 12-34 IRD branded cassette. It has Dura Ace STI shifters, a Dura Ace fd and an XTR Megarange rd (all circa 2005).
It gives us a huge range (24-122 gear inches, if I do the math right). We never have any issues shifting. The only time we had to walk was that 20+% hill in the Hilly Hundred last year.
Ever used the 54-12?
Duppie said:Our Co-Motion Speedster tandem has triple front (54-42-30) and a rear 12-34 IRD branded cassette. It has Dura Ace STI shifters, a Dura Ace fd and an XTR Megarange rd (all circa 2005).
It gives us a huge range (24-122 gear inches, if I do the math right). We never have any issues shifting. The only time we had to walk was that 20+% hill in the Hilly Hundred last year.
Yes. But only on downhill with the wind in the back ;). At those times we fly!
But usually we don't need to pedal on a downhill at all. We're not a lightweight couple and our weight just makes us go faster than anyone else. We top out at around 40 mph, because I don't feel comfortable going much faster, even though we could.
A few pics from different setups:
Here is a pic from us going downhill during last years Midwest Tandem Rally in Rochester, MN going about 30 mph without pedaling.
This is a pic from our touring setup at the start of a 4-day self-supported tour through Central Michigan.
This is a pic from our credit card tour of the Route 66 bike trail last year
Kelvin Mulcky said:Ever used the 54-12?
Duppie said:Our Co-Motion Speedster tandem has triple front (54-42-30) and a rear 12-34 IRD branded cassette. It has Dura Ace STI shifters, a Dura Ace fd and an XTR Megarange rd (all circa 2005).
It gives us a huge range (24-122 gear inches, if I do the math right). We never have any issues shifting. The only time we had to walk was that 20+% hill in the Hilly Hundred last year.
Our Co-Motion Speedster tandem has triple front (54-42-30) and a rear 12-34 IRD branded cassette. It has Dura Ace STI shifters, a Dura Ace fd and an XTR MegaRange rd (all circa 2005).
It gives us a huge range (24-122 gear inches, if I do the math right). We never have any issues shifting. The only time we had to walk was that 20+% hill in the Hilly Hundred last year.
Kelvin Mulcky said:I think that the shimano road derailleurs are speced to handle a max of 27 teeth on the cassette. That is a bit of a conservative estimate and they actually work with 28t, but not more. Above 28t your derailleur pulleys will rub on the cassette. You can use a LX, XT, or XTR derailleur to handle a larger cassette and they will shift perfectly with the dura-ace sti.
You could also get a smaller-ringed crank (that's what i did to solve a similiar issue before a tour on my cross bike), like 42-32-22. That way you can use a more tightly spaced cassette like 11-28 and still have good hill climbing gears. You'll spin out of 42-11 on big descents, but at 35mph you'll probably be coasting anyways...
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