octalink wasn't around when 8spd cranks were.......Pau11y said:Heidi, I saw this in rec.bicycles.marketplace. It's an 8 spd crankset (7402 w/ 39/53 rings). But if the BCD is correct (130mm), then it should take 9 spd rings. I believe the 8 spd rings should work tho. Anyway, check it out. Just make sure it's Octalink and not square taper.
http://groups-beta.google.com/group/rec.bicycles.marketplace/browse_thread/thread/f656bf0796a4be9c/0dd0fbc06857944c#0dd0fbc06857944c
splat said:Heidi, what size are your current cranks ?
Is this because of the Knee issues ?
One of the toughest efforts to quantify but when I am fatigued it takes great concentration to power the full circle. I have difficulty doing this on the rollers and have ridden off the side when my mind wanders after 90 minutes or so.Heidi said:get my brain trained to that "perfect circle" that you hear all cyclists babble about.
Yah, I always think I am, but am not sure until I ride on the computrainer with the spin scan right there telling me my score.Serial Midget said:One of the toughest efforts to quantify but when I am fatigued it takes great concentration to power the full circle. I have difficulty doing this on the rollers and have ridden off the side when my mind wanders after 90 minutes or so.
It's really more that I can't reach the top of my pedal stroke completely, it's hard for me to snap over the top because I feel as though my leg doesn't come up that far! I already took a crapload of measurements and stuff so I know my seat height is right, and the angle of my him to my foot when in the bottom position is around 165 degrees. And that's not true, a lot of pros can and DO have a perfect circle...well, better than mine If you aren't using any uppull, than how efficient is that? I'm not saying I don't, but after making a couple adjustments, I am now using a lot more of the upswing and getting a crapload more power output from my hamstrings.indieboy said:oh man
heidi don't fall into that perfect circle bull****. most of the top pro's couldn't and DON"T have a perfect circle pedal stroke, it's actually more oval shape. all that truely matters in the long run is what you are physically capable of pushing out
I did, I was wondering what they were.Wumpus said:Maybe you should get some of these:
Did anybody else notice Julich using them in the mountain and TT stages of the Criterium International?
So who had the 'privilege' to ride biopace rings? I put round rings on as soon as the bios wore out.To get the obvious question out of the way, this isn't a resurrection of Shimano's Biopace rings of the 1980s. An elliptical chainring changes the effective gear ratio as you pedal. Biopace reduced the gear ratio as crank passed through the horizontal; the O.Symetric Harmonic increases it. The idea is that the sector of the pedal stroke where the crank is horizontal or nearly so is where you can push hardest, so it makes sense to increase the gear at that point, then drop it to get your foot through top and bottom dead center quickly. It's the same idea as British component maker Chris Bell's Eggrings and, well, just about every other inventor who has come up with elliptical chainrings since shortly after chain drives were invented.
However, while the idea has come and gone many times in the last 100 years or so, it clearly seems to work for Bobby Julich, who has used the O.Symetric rings to land an Olympic bronze medal, and to contribute to CSC's team time trial victory in the Tour Méditerranéen.
The O.Symetric rings are mounted on 172.5mm FSA Superlight cranks, a monocoque carbon fiber crank that turns on an oversized ISIS spline bottom bracket. At the ends of the cranks are Speedplay pedals, long a CSC team pick.
I did !Wumpus said:So who had the 'privilege' to ride biopace rings? I put round rings on as soon as the bios wore out.
" It was over a year and half ago that we saw these strange looking rings on Julich's bike in Hamilton, Ontario Canada during the 2003 World Road Championships. There he claimed that the rings, "we good for 5 seconds per kilometer."indieboy said:he's been using those since the olympics. it's a normal sized 53t ring
Looks huge but if I counted right behind the crankarm its only a 52.splat said:Campy use to make ones like that back in the 80's and then Shimano followed with Bio-pace !!!
dam how many Teeth are on that thing!!! it looks huge!
That'd be a tough one, because I don't see any parts that are out right now that have major flaws and are the only things available.....well maybe rapid rise? But I actually like it. I know! Square taper Campy cranks!Just James said:My favorite was the Bio-Pace knockoff called "Oval-tech."
Ha ha ha, they were quite the cutting edge, but look at them now! I wonder what current "cutting edge" products are going to look stupid as hell in 10 years or so?