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  1. #1
    Brown Bear, Sqrl Hunter Jaytron's Avatar
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    Crank length (mass start/sprint)

    I know for most sprinters the crank length is your road bike crank -5mm. Is the same for somebody that does mass start races and what not? That would put me at 167mm cranks or so. Are 170mm cranks really that much harder to spin at high speeds?
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    Senior Member Velocirapture's Avatar
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    Depends to an extent on your leg length and overall height. going from 170mm to 165mm for me made a big difference to the 'spinability' for me - but i'm on the short end of the spectrum. A lot of the guys in my club are happy to spin 170mm cranks.

    There is also the issue of catching a pedal on the embankment if you are going slowly (obviously more likely on longer cranks) - which is probably not that likely to happen in a mass start sort of event, but has personally happened to me in a match sprint (although granted, i was riding an old steel bike with a fairly low bb at the time) - lets just say it was pretty nervewracking, high up in the turn..

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    Brown Bear, Sqrl Hunter Jaytron's Avatar
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    The embankment isn't really an issue at my velodrome, the banking isn't too steep.

    I'm about 5'10, 5'11. I think a 33" inseam? How tall are you?
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    Elitist carleton's Avatar
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    In short, it depends. You give up cadence and gain torque when the crank arms get longer and you give up torque and gain cadence when the crank arms get shorter. You really have to just try them out and see what suits your body and riding style.

    Try them for more than just a few minutes on a trainer/rollers. Give them a try for like a week and evaluate.

    Ask friends/teammates/locals to see if they have some laying around that match your current BB. Many people have sets laying around that you might borrow if they are so inclined.

  5. #5
    VeloSIRraptor
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    I moved from 165s to 170s two years & didn't notice all that significant of a difference.

    It'll all be good as long s you are under 170s.
    Quote Originally Posted by shovelhd View Post
    If it comes down to a field sprint, you probably won't win, so don't let it.

  6. #6
    Senior Member Brian Ratliff's Avatar
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    I don't think mass start racers pay too much attention to crank length. Most I've seen use 170s, which is about what they use on their road bike. Sprinters pay attention; I am a leg speed sprinter and when I tried 172.5mm, I just couldn't rev it like I can the 165s. But like carleton said, it's just a tradeoff between max revs and gearing. The rule of thumb I use is 5mm on the crank is worth about 2 gear inches in torque.

    Carleton, I see your location is now Portland. Does this mean we'll be seeing you out at Alpenrose this year? Every Friday from May through August is sprints.
    Cat 2 Track, Cat 3 Road.
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    Senior Member zizou's Avatar
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    In Glasgow 165mm is the maximum allowed, although i think there is a little unofficial leeway allowed for more experienced riders and particularly pursuiters

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    Elitist carleton's Avatar
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    Quote Originally Posted by Brian Ratliff View Post
    Carleton, I see your location is now Portland. Does this mean we'll be seeing you out at Alpenrose this year? Every Friday from May through August is sprints.
    Yup! I'll be there.

  9. #9
    Senior Member Brian Ratliff's Avatar
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    Quote Originally Posted by carleton View Post
    Yup! I'll be there.
    Cool. We have a pretty good group of sprinters here; should be fun.
    Cat 2 Track, Cat 3 Road.
    "If you’re new enough [to racing] that you would ask such question, then i would hazard a guess that if you just made up a workout that sounded hard to do, and did it, you’d probably get faster." --the tiniest sprinter

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    VeloSIRraptor
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    Quote Originally Posted by Brian Ratliff View Post
    Carleton, I see your location is now Portland. Does this mean we'll be seeing you out at Alpenrose this year? Every Friday from May through August is sprints.
    Quote Originally Posted by carleton View Post
    Yup! I'll be there.

    Monday is now sprint-mania at Marymoor for this season - just a bit away :-)

    I'll be down to Alpenrose a few times this year to get time on a shorter/steeper track before collegiate nats in Sept... hope to see you two around?
    Quote Originally Posted by shovelhd View Post
    If it comes down to a field sprint, you probably won't win, so don't let it.

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    Quote Originally Posted by Brian Ratliff View Post
    I don't think mass start racers pay too much attention to crank length. Most I've seen use 170s, which is about what they use on their road bike.
    I ride 170's on the track including pursuits though have bought some 175 arms which I may try for next years IP's. Have 172.5 on the commuter and CX and 175's on the road and TT bike...
    http://climbinglama.blogspot.com.au

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    Elitist carleton's Avatar
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    Quote Originally Posted by Brian Ratliff View Post
    Cool. We have a pretty good group of sprinters here; should be fun.
    That's great to hear.

    Quote Originally Posted by Hida Yanra View Post
    Monday is now sprint-mania at Marymoor for this season - just a bit away :-)

    I'll be down to Alpenrose a few times this year to get time on a shorter/steeper track before collegiate nats in Sept... hope to see you two around?
    Ha! I knew it was close, but I didn't realize that it was less than 3 hours away. Nice. I'll be there, too

  13. #13
    Senior Member Brian Ratliff's Avatar
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    Quote Originally Posted by Hida Yanra View Post
    Monday is now sprint-mania at Marymoor for this season - just a bit away :-)

    I'll be down to Alpenrose a few times this year to get time on a shorter/steeper track before collegiate nats in Sept... hope to see you two around?
    Mondays at Marymoor, eh? I'll have to check that out; maybe bring a teammate or two.
    Cat 2 Track, Cat 3 Road.
    "If you’re new enough [to racing] that you would ask such question, then i would hazard a guess that if you just made up a workout that sounded hard to do, and did it, you’d probably get faster." --the tiniest sprinter

  14. #14
    Senior Member xengravity's Avatar
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    Quote Originally Posted by Hida Yanra View Post
    Monday is now sprint-mania at Marymoor for this season - just a bit away :-)
    Where was this announced?

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    VeloSIRraptor
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    Quote Originally Posted by xengravity View Post
    Where was this announced?
    hasn't been yet, and the info I got isn't official, so I'm not promising that it won't change between now and later
    However, being friends with the folks who are on the board & write the schedules doesn't hurt.

    Not-official-but-the-plan-as-of-last-week:
    Mondays- Sprint events (& Cat4s as it has been in the past)
    Tuesdays- Nothing official scheduled, but everyone knows to show up for open-track training
    Wednesdays- Master's racing & Cat4s (as it has been in the past)
    Thursdays- Pursuit events & Cat5s
    Fridays- Fast Folks
    Saturdays- Juniors
    Sundays- Nothing official scheduled, but everyone knows to show up for open-track training
    Last edited by Hida Yanra; 02-21-13 at 01:53 PM. Reason: clarification
    Quote Originally Posted by shovelhd View Post
    If it comes down to a field sprint, you probably won't win, so don't let it.

  16. #16
    VeloSIRraptor
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    Quote Originally Posted by carleton View Post
    Ha! I knew it was close, but I didn't realize that it was less than 3 hours away. Nice. I'll be there, too
    Quote Originally Posted by Brian Ratliff View Post
    Mondays at Marymoor, eh? I'll have to check that out; maybe bring a teammate or two.
    The GP in July is on the nationals calendar - looks to have a bunch of national points & prizes on offer... also, the ever-elusive national-level TP if you know anyone that likes that sort of group S&M.
    Quote Originally Posted by shovelhd View Post
    If it comes down to a field sprint, you probably won't win, so don't let it.

  17. #17
    Senior Member xengravity's Avatar
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    Quote Originally Posted by Hida Yanra View Post
    hasn't been yet, and the info I got isn't official, so I'm not promising that it won't change between now and later
    However, being friends with the folks who are on the board & write the schedules doesn't hurt.

    Not-official-but-the-plan-as-of-last-week:
    Mondays- Sprint events (& Cat4s as it has been in the past)
    Tuesdays- Nothing official scheduled, but everyone knows to show up for open-track training
    Wednesdays- Master's racing & Cat4s (as it has been in the past)
    Thursdays- Pursuit events & Cat5s
    Fridays- Fast Folks
    Saturdays- Juniors
    Sundays- Nothing official scheduled, but everyone knows to show up for open-track training
    This schedule is fantastic. I hope it becomes official. The only other thing I can think of to make this perfect is to split the 1/2's.

  18. #18
    VeloSIRraptor
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    Quote Originally Posted by xengravity View Post
    This schedule is fantastic. I hope it becomes official.
    Me too, there are enough racers from Marymoor headed to nats, seems a pity to only have any given pursuit or sprint event +/-2x per year.

    Quote Originally Posted by xengravity View Post
    The only other thing I can think of to make this perfect is to split the 1/2's.
    Eh, you are fast enough, I'm sure you'll do well this coming summer - your results at Burnaby have been impressive
    Quote Originally Posted by shovelhd View Post
    If it comes down to a field sprint, you probably won't win, so don't let it.

  19. #19
    Senior Member Velocirapture's Avatar
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    Quote Originally Posted by Jaytron View Post
    The embankment isn't really an issue at my velodrome, the banking isn't too steep.

    I'm about 5'10, 5'11. I think a 33" inseam? How tall are you?
    I'm really on the short end - 5'3, 28" inseam. The 165 cranks are much easier for me to spin than the 170's, especially in an aggressive position on the bike.

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