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Old 08-23-11, 09:58 AM   #1
BrainInAJar
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Full set of cogs & rings?

So, my regular track is Burnaby ( 200m, 47 degree, indoor wooden track ) which has gearing restrictions for B/C/D riders.

Thus far I've just been keeping my bike set up to be legal and forgetting about it ( at 47x15 ) but I bought a new bike that comes with illegal but seemingly the most common gearing (49x15) and I'm wondering, if I were unrestricted on this track and if I wanted to go race in Victoria, Marymoor or Alpenrose what other gears would I want to pick up? That is, what is a reasonably complete minimal spanning set of rings & cogs?
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Old 08-23-11, 05:53 PM   #2
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You should consider both a warmup gear in the 78-82 gi range based on 27" nominal tire diameter and racing gears ranging from 88-92 for various tracks and weather conditions. I have a 16T cog for warmup and a 14T cog for racing, combined with 46,47,48 chainrings. Since you already have a 15T cog, you could use it with the 47T chainring to give you the legal gearing at your home track. Also, you could initially skip the 48T chainring, since a 92gi gearing is pretty high for most situations. I do almost all of my racing on 47x14 (90gi), which with 47x16, gives me about 79gi for warmup.
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Old 08-24-11, 05:59 AM   #3
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I race at alpenrose and would agree with getting a warm up gear and race gear. I just covered my basis and have 48/49/50 and 14/15/16 I find that gives me plenty of range on how many GI I need for different events
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Old 08-24-11, 11:36 AM   #4
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I race at Hellyer and LA Velodrome. I have 47/48/49/50 and 14/15/16/17. I find racers are always playing around with gearing. It also depends on the type of racing you do and if you do any motor pacing.
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Old 08-24-11, 10:13 PM   #5
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A 13t is nice for over-geared training. Cogs are much cheaper than rings so why not get the whole set?
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Old 08-24-11, 10:39 PM   #6
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Cogs are much cheaper than rings so why not get the whole set?
More of a pain to swap out?
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Old 08-25-11, 12:05 PM   #7
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Racing at Alpenrose, I have 47-51 rings and 14-17 cogs. My most used combos are 48/14 and 49/14 (92" and 94" respectively) for sprinting, 50/15 and 51/15 (90" and 92") for mass start. If you have flip-flop hubs, 48 or 49 chainring goes well with a 16 cog for warmup; likewise, the 50 and 51 rings go well with a 17 for warmup.

Also, Alpenrose is really bumpy compared to ... well ... any other track in the world. We tend towards smaller gears here. Even amongst the elite riders, you don't see many people over 94" for anything.
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Old 08-25-11, 02:17 PM   #8
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I have always found cogs easier to change out than rings, even with the female sides of the chainring bolts JB welded to the crank spider.

I also change out my gearing much much more for training than I do for racing.

Brian, my guess is you have never been to our wonderful Mr Bumpyface.
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Old 08-26-11, 04:28 PM   #9
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I always brought my full race kit, 46t to 50t + 52t rings, 13t to 17t cogs to the track (Marymoor) every training session and every race night. That said, I NEVER changed the gear at the track. But I could have, if I really wanted to. If you bring stuff, it's a guarantee you won't need it. It's the thing you leave at home that you'll need. My usual gearing at MM was 49X15, sometimes 52X16. I won a race in the 3s there with a 48X15 once. The track looks to be smoother/faster these days, YMMV.
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