It's impossible to spin 250 off of rollers.

an ha?

not if u achieve xen

lol

Keirin racers.

Both. Spinning at high RPM's train your muscles to fire faster which is good for explosiveness on the track. If you can be stable at 200's on rollers, you'll be smooth at 160's sprinting on the track.

Simply because you aren't able to do it doesn't make it impossible. A lot of the elite sprinters train by spinning out 200+ RPM's.

lightbulb!

you're from around here, aren't you??

(here is seattle)

yup

on rollers.

Considering that we are talking about rollers, yes, rollers. I hope you weren't assuming by horseback?

I think you misread my original comment. I do not doubt you can spin 250+ on rollers.

I said it was impossible to spin that fast off rollers. You said you can. I said on rollers. You say of course on rollers.

That's how I follow it.

Before the story changed.

1) Being a smoother pedaler starts with a proper saddle height. In short, if your saddle is too high or too short you may bounce.

2) There will be a certain resonance frequency that will cause bouncing...even in trained riders.

3) Shorter cranks help. On 170mm cranks, I bounce around 120RPM, but I'm smooth before and after that. On 165mm cranks, I'm smooth all the way up to 225rpm.


On the road, you don't want to let your bike/cranks get going too fast and get away from you. Stay in control. Use a brake.

CITATION NEEDED.

You can spin 250RPM on rollers? Pics or it didn't happen.

carleton has spoken.

I knew it.

Here's what 250+ looks like:
Kevin Mansker. National Champion. Been to Worlds. Handful of National podiums as well. Holds nine total track records at various velodromes (pretty sure Carleton is gonna take a whack at them at Alpenrose, Mansker's original track.)


And this is on a stationary bike.

how u do standing up********************?

You be a National Champion.

And that's why stationary bikes freak me out. Seeing that move like that while under force, that and the pedalling while going nowhere thing...

"Come on!"

I pretty much approach every hill with an ounce of fear and caution because of this. I have the brake for when I need it but am also working on being able to bring myself to a stop without it when possible. Knowing how fast I can comfortably spin and how to improve that came from wanting to know how to stay in control of the bike during descents, where I feel very much OUT of control right now, especially if things start escalating. To make matters a little more complicated, my bike came with a 50:16 gearing, which makes for some low rpms during most of the riding. I have a 17 tooth cog on order and will start with that - should I also be thinking about a 49 tooth ring to go with that? Or should I just plan my routes to include more open hills to roll down for practice?

What's a picture going to prove? A video is better.


You knew what?

Manskers video shows a sprint at 9-10 seconds. I'm hitting the close to the same cadence over 20-30 seconds (i'm last in the video at 2m20s).

Good job and nice video, but I think that's closer to 180-200RPM then 250. Look at the video of Manksker and create a drum beat of his cadence in your head. Then look at your video.

If you really want, I can use quicktime and do a frame by frame calculation.

Also, you'd be faster if you raised your saddle a lot.

I'd like to see how this spins out with proper saddle position... I'm thinking that things will slow down as those legs will be travelling farther when they are moving with proper range of motion.

In the real world I have got up to 180rpm on descents pushing 82 gear inches and maintained a very smooth cadence and secret for this is not to let the pedals drive your feet but for you to keep driving those pedals with enough power to maintain that cadence and pedal contact as if you back off the ride might get a little bumpy.

I have always run a brake which makes bleeding off speed much easier than trying to resist a crank and drive that has that much kinetic energy and it takes a fairly perfect setup and well developed technique to spin effectively at high rpm.

I always say I spin like a gerbil on crack... now I just do it with a lower gearing.

This is a good thread!

This reminds me of those guys that come in here and try to brag about their high speed based on a Strava reading. That video doesn't offer any evidence of being able to spin 250 rpm. It's just some bros on stationary rollers playing a game. I like to play video games too, but you don't see me passing that **** off as real life.

:lol:

Also, you can see your speed in the top right corner, you appear to average 82 km/h. Your total time to 500 meters was 21+ seconds, which confirms your average speed. Your max appears to be around 84 km/h. At these speeds, in a reasonable track gearing of around 94 inches your cadence would be around 190-200. In order to hit 250rpm your speed would need to be around 110 km/h. Which we can clearly see, it is not. The gearing would have to be significantly lower for your estimate to be true.

I can post up the math later if you're interested.

Yes, please do that. Using basic math is a lot easier however.

Certainly, that's a given. We don't get to choose our bikes or gearing. You'll notice we are wearing regular tennis shoes and street clothing and are not clipped in. Being several beers in probably doesn't help the speed either.



You guys are hilarious. Why are you so mad?

Perhaps the red time was averaging 82 but i'm in blue. If you look at the video i'm clearly hitting 90's and let up a few seconds before the end.

Go look up the results and look at the fastest times:

I'm hitting 18's over 500m on a 47x15 gear; tell me what the cadence is for that. Yes, and please post the math.

Edit - online calculators:
Calculate speed from time - http://www.machinehead-software.co.u...time_calc.html
Calculate cadence from speed - http://www.bikecalc.com/speed_at_cadence