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Small Double(10 posts)

Small Doubletheeatkins
Feb 17, 2003 7:04 AM
I am planning to do the Death Ride this year. For those infamiliar, it's 129 miles and 16000 ft on climbing. I was thinking of trying to swap out my 39-52 chainrings for a set of 24-39 or something. Can this be done? I realize I will have to shorten the chain, but I don't see any other problems. That is other than getting the chainrings to fit. Can anyone help?
probably notDougSloan
Feb 17, 2003 7:21 AM
First, the Death Ride hills really aren't that steep. There are just lots of them at high altitude. I think I used a 25, but at the time I was in good shape and finished in the top 30 (of about 2500 starters, but not everyone does the whole thing).

The smallest ring you can put on Shimano is 38, and Campy 39.

If Shimano, I'd use either a 12-27 Ultegra/Dura Ace or 12-32 or 34 XT or XTR cassette. If the latter, you'll probably need an XT or XTR rear derailleur, too.

You'll want the 52 on the long descents, particularly from the last mountain, which is not very steep and fairly long. You'll spin out with anything less than a 52x12.

Doug
You PEDALLED on those descents?cory
Feb 17, 2003 9:22 AM
I haven't done the Death Ride, but I've done most of the passes on my own because I live nearby. I think I can say honestly that the total number of revolutions my crank made on the downgrades was fewer than 10.
of courseDougSloan
Feb 17, 2003 9:37 AM
I was racing the darn thing. I pedal until I spin out, which is over 50 mph.

Doug
what's the RPM for a 53x12 at 50+ MPH!ColnagoFE
Feb 17, 2003 10:12 AM
Man....I'm lucky if I can get much over 40 before I decide to just tuck and coast.
142DougSloan
Feb 17, 2003 3:56 PM
About 142; here's a spreadsheet calculator: http://www.midcalracing.com/gears.xls . I usually use an 11 cog, though, which drops it to 130 rpms -- big difference.

Doug
If you spin out the 13 who cares?ColnagoFE
Feb 17, 2003 9:25 AM
Just coast man!
re: who cares? you docyclopathic
Feb 18, 2003 7:49 AM
there's a reason why you need to work on downhills sometimes. You don't wanna loose draft, esp if you sucking on tandem's rear.
re: Small DoubleFrenchPress
Feb 17, 2003 9:19 AM
To change the chainrings, you'd have to put on a mountain bike crank and a new rear derail. Just not worth it. Use a different casstte. Something with a 27 would be OK, or go Atb W/ a 11-34. BUt then, you'd need a long cage rear deraileur. It all depends on how much work you want to do.
Why not to consider triple?al0
Feb 17, 2003 1:08 PM
nm.