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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 04-14-03, 07:14 AM   #1
captsven
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Fastest rpm on downhill?

I have put a cadence sensor on my fiwed gear. I got to 142 rpm on my 42x16 with 172.5 crank arms. I felt a little out of control but it was a rush.

I have read of people spinning alot faster than this and was wondering how fast other people get.
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Old 04-14-03, 11:11 AM   #2
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to tell you the truth, i have no idea.

i find the idea of putting electronics on something as simple/pure/etc as a fixed gear to be a little contradictory, so i have no surefire method of finding out.

then again, that sort of thing isn't much of a concern to me anyway.
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Old 04-14-03, 11:33 AM   #3
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I just ride on gear on my commutes and average around 130rpm. I have a 4% decent on the way into the office and I hit over 180rpm most of the time. My PR is 192rpm on that decent. I can easily do 150rpm on flat ground, just takes a bit out of me.
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Old 04-16-03, 08:41 AM   #4
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The other night I hit 40mph. Using an online cadence calc. it looks to be 199 rpm w/ 700x35c tires and 170mm cranks.
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Old 04-16-03, 09:26 AM   #5
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I figured I was a wimp. I have alot of work to do!!!
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Old 05-16-03, 04:14 AM   #6
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Originally posted by Styk33
I can easily do 150rpm on flat ground, just takes a bit out of me.
C'on! Tell that to sweenies.
At quite a rate of knots you should be flying then most of the time

Just kidding. Teffific... outstanding, and all that. I wish I could do something like that. Whenever I hit 120 rmp my bum's just all over the place, and all of my efforts go into keeping the thing in the right place on the bike, and the bike on the track for that matter, and not, unfortunately, into moving forward and putting up better lap times.
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Old 05-16-03, 09:23 AM   #7
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One of the kids that works here,cat3 good sprinter, running around 60 gearinches and 165 cranks hit 236rpm going down a steep hill.
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Old 05-17-03, 03:19 PM   #8
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This same guy spun up a trainer so high the flywheel destabilized and came apart, he did not get hit but the pieces punched a hole in a door and the wall and dinged his frame.
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Old 05-18-03, 06:54 PM   #9
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Whenever I hit 120 rmp my bum's just all over the place
this happens to most at a certain RPM right around 120, once you get your RPM higher than the "bounce range" everything gets smoother
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Old 05-18-03, 07:11 PM   #10
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Originally posted by riderx
The other night I hit 40mph. Using an online cadence calc. it looks to be 199 rpm w/ 700x35c tires and 170mm cranks.
Not sure what chainring/cassette ratios you are running, but I often hit 35 mph on our Philadelphia area hills (the surrounding counties) in the 53 chainring with 12-25 cogs in the back. I am spinning around 110 at the time with my 17-18 cogs. Going over 40 mph at various points pushes that up above 120. I consider myself a 'spinner', but cannot hold my cadence above 130-5 without getting sloppy.

If you are spinning at 199 your legs are truly a blur of motion. My guess is that the online program you are using is very optimistic. Anything over 150 rpm is really spinning up a storm. I'm going to have to dig out my gear-in charts and calculate some speeds now that you've brought this up.

The peleton in today's stage of the Giro were doing about 48 mph on the 6 mile downhill into the finish run. They were running 53 with 11 or 12 or 13 cogs and none of them that I could see were spinning at much over 100-110 rpm. These guys were flying and it was the entire peleton.

Also - Congratulations to Cipo on winning his 41st stage in the Giro. He is quite the competitor as well as being very entertaining.
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