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Long Distance Competition/Ultracycling, Randonneuring and Endurance Cycling Do you enjoy centuries, double centuries, brevets, randonnees, and 24-hour time trials? Share ride reports, and exchange training, equipment, and nutrition information specific to long distance cycling. This isn't for tours, this is for endurance events cycling

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Old 09-10-06, 12:52 PM   #1
mosscoveredhat
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Century on a fixed gear...

I know there are probably other threads about this, but I couldn't really find what I was looking for...I am planning on doing a century on my track bike... With rolling hills, what would be a good gear ratio? I will be riding with a brake...
Thanks
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Old 09-10-06, 01:39 PM   #2
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I'd suggest a 71 - 74" gear. Hope this helps.

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Old 09-10-06, 01:43 PM   #3
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I've done them running 69 inches but also had 78 inches on the flip side and used that after all of the long climbs were out of the way...

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Old 09-10-06, 09:15 PM   #4
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Ok thanks, this helps. I think I will go with 75, but I guess I could take some extra cogs if that doesn't feel good.
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Old 09-11-06, 02:26 AM   #5
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I run about 70" but how do I know how strong you are or how nasty your hills are?
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Old 09-11-06, 04:11 AM   #6
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I run a 70-- 48x18 -- I have been able to get up some pretty long and steep hills-- the only down side is the downhills-- I use the brake to control the speed on the downhills-

Riding a century on a fixie is a blast!

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Old 09-11-06, 09:43 AM   #7
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Quote:
Originally Posted by mosscoveredhat
.....but I guess I could take some extra cogs if that doesn't feel good.
I assume you won't be using a lockring if you'll be swapping cogs on the road. The axle nut wrench is all you need. Of course, running a flip flop hub is more practical and faster.
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Old 09-11-06, 02:11 PM   #8
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I would consider the last part of the ride the most important and
under gear. I think at mile 75 you will be glad you are rolling 71 inches
instead of 74 or higher.
Good luck !! Great undertaking
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Old 09-11-06, 02:35 PM   #9
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Originally Posted by -=Łem in Pa=-
I would consider the last part of the ride the most important and
under gear. I think at mile 75 you will be glad you are rolling 71 inches
instead of 74 or higher.
That would all depend on the ride profile....
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Old 09-11-06, 05:03 PM   #10
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i've ridden 3 fixed centuries, and 1 metric, of varying terrain. one thing i can say is that do a few practice runs of about 30 miles or so with in any ratio you're thinking about using. i'm 23, very fit, and have healthy knees but BOY does that 1 tooth up or down change things around mile 85-90. my knees felt like a trainwreck after moving from a 15 rear to a 14 rear for the same century ride, 3 months apart from each other.

for the flats, i like a 74.
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Old 09-13-06, 01:26 PM   #11
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I did 125 miles in rolling hills on 70.6, and a few metrics with this ratio as well. It felt pretty good but once the headwind got blowing I may have been comfortable with even less. So personally I would say around 70, depending on the hills, the wind, what you have to carry, and your legs.
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Old 09-14-06, 06:46 AM   #12
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i've gone 70 miles on 47/17 whatever that is. pretty rolling terrain west of boston.
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