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Gearing(5 posts)

Nov 16, 2002 7:37 AM
What gearing do you run on your fixie? I'm considering a 52-20, but there is some concern that might be a bit much. Not many hills to climb, but I'd like to spin 100-110 most of the time. That puts me around 20-21 MPH.

Gearing for road has always been typically around 2.5:1 ...Humma Hah
Nov 16, 2002 9:09 AM
... dating back over 100 years. My cruiser came 46:18 (2.56:1), and I'm back to that ratio again after experimenting around. I'm planning a change to 48:18 (2.67:1) for local riding (short hills, a few of them moderately steep), with a switch to lower for epic rides (like maybe a 200k brevet with 6900 ft of climbing). My 26" 1 3/4" balloon tires are actually slightly larger diameter than most 27" or 700c roadbike tires, so the gear inches work out about the same.

I have ridden taller. I've gotten the cruiser up the Torrey Pines park drive, probably better than a 10% grade in spots and about 320 ft of climbing, in 46:16 (2.88:1). The MTB's top gear is 42:14 (3:1), and I can climb anything in town in that gear if so inclined.

I rode most of 2001 in 42:18 gearing (2.33:1), and the result was significant muscle atrophy.

I've ridden quite a bit off-road at 2:1, and have combinations available to go lower. 2:1 is the standard for singlespeed MTB, and Travis Brown has been known to compete, and WIN, at cyclocross with a SS set up in that vicinity, against geared bikes.
re: GearingLC
Nov 16, 2002 12:16 PM
it really depends how strong you are, but many shoot for around 69 gear inches. If I did not have many hills around I would go for 52x20 which is about 69 gear inches.
That is my ratio/gear inchTig
Nov 16, 2002 3:14 PM
I ride a 39 X 15, which provides the exact same gear inch of 68.6 (with 25 mm tires) as a 52 X 20 combination. I'm a spinner, not a masher, but I need to build strength for climbing and pre-sprint buildups. This gearing works well for my weekend group rides until 26 MPH, yet not too high for solo rides. It is a bit tough for recovery rides (I use the 16 tooth freewheel instead) and can be difficult for long headwind legs. It all depends on what you need.
re: Gearingfixedgearhead
Dec 5, 2002 7:11 AM
My gearing is almost exclusively 42/15.That works out to 76 gear inches on a 700/23 tired bike. There are some bikes that I own that have 43/16 but they are rather special purpose bikes. For gereral use the 42/15 works for me I cruise at 17-20 mph and can sustain 25mph if I really want to try. I ride quite a lot and am in pretty good shape. 50-75 miles a day 5+days a week, year round. The winter not as much. If you are just starting out you might choose 42/16. You can always get a different rear cog at a later time if you find the ratio not to your liking. I even have one off road single speed that is geared 36/16. Boy does that thing spin easily. But it is needed to climb steep hills in the dirt. Hope this helps.