If you have any questions about climbing on the V2r, call Dave at Paketa. He and his wife live in Colorado and ride their V2r in the mountains every day.
Also, if you're not sure about a double. You can always opt for the V2. The mag frame is fantastic!
Many thanks for the reply - i have put this question directly to Dave Walker and will wait for his response - you are right the V2 with a triple is the obvious compromise - i just really like the right side timing belt!
Fast tandems caught my eye.
Fastest tandem in the tandem field on this years Haystack Time Trial in Boulder CO was Greg and Lisa Mangus, 16.4mi course in 36:35 per the ACA results page. That's 26.8mph. The lead peloton of 7 tandems in LoToJa Classic 2011 finsihed the first 34 miles (of a 206 mile race) in 1:07 per the 2011 results page. That's a hair shy of 30.5 mph for a nearly flat 200 ft gain segment. Two teams went on to finish all 206 miles, 7,300 feet of climbing in under 10 hours. They averaged 21.5 for the final 45 miles and about 650 feet climbing.
Another thing I like about it is that while us guys were all serious and talking about wheels, weight, gearing, frame material and average speeds, the stoker put something pink and fuzzy under her seat. That puts our silly tech talk in perspective
Not slow, not fast, but Half Fast!
The V2r gearing typically uses an 11-36 cassette, 38 or 39 to 52 or 53 from rings. Sufficient for just about any climb up to 15% if short. For some teams in the thread maybe enough for even long climbs. Gates has mentioned coming out with a compact 110bcd sprocket which would be lovely to offer more range of gearing for the V2r, but no confirmation on that rumor yet.
For the post asking about climbing, for us, upgrading from the V2 to the V2r improved our climb rates and adds at least 5% to our efficiency.
In terms of rim heat dissipation question above, we also ride in the Rockies and are about 190# buck naked. Last year we did all the top 10 highest paved passes in north america, all here in CO on our "old" Paketa V2 with caliper brakes. Little if any heat problems with the 34mm deep rims. In fact we have temperature reading "plates" to mark the high temp and never exceeded 200 degrees. There is another post somewhere in the forum from about a year ago with more details on this topic and the temp plates by palmer wahl. I believe that is part of a discussion on the forum about the merits of disk versus rim brakes, roughly concluding either is a fine option if done properly, and either can fail if not done correctly. Although I believe that posting also noted that heavier teams or touring weights certainly make the braking harder to solve.
FYI we are now on 30mm front and 38mm rear kinlin rims for similar heat dissipation reasons.
Ridding the world of derailleurs, one bicycle at a time.
46 Hercules Roadster, 49 Hercules Kestrel, 50 Norman Rapide, 51 Hercules Lion, 52 Hercules Windsor, 56 Hercules Royal Prince, 61 Fiorelli Tandem, 67 Carlton Super Race (IGH), 70 Schwinn Collegiate (IGH), 71 Hercules, 71 STF Hercules, 72 Peugeot PX-8 (IGH), 76 Raleigh Sports, 77 STF Raleigh Sports, 77 Jack Taylor Tandem, Early-80's Mike Appel SC, 84 Davidson Tandem, Late-80's Alpine, 10 Bilenky "BQ" Signature Tandem
Sorry, 290# not 190#.
We ride a particular climb in our area about once a month. And for the last year or more we have been working at whittling down our time but have been stuck at the same time. The first time up it on the V2r about a month ago we beat our time by almost 15%. Attribute some of that to adrenaline, although we were not chasing any singles. Attribute some of that to a few pounds off me and the bike since the last best time. We had the same average heart rate on the ascent with the V2R as the most recent prior attempts, so we were working as hard as always. After all that I still get easily 5% attributed to the right side drive. And riding one, that feels obvious; when I stand at the captain's position the bike does not lean under me like every other tandem I've ridden, instead I feel my pedal stroke pulling directly against the rear wheel.
A right side chain would work to get a compact crank. But the belt is so nice I would not give that up. We are within 5% of the low gear we'd like to have, mostly for long duration climbs, so we can makeit until we solve the compact crank belt equation.
Last edited by Turbotandem; 09-19-12 at 09:52 PM.