Single Speed Gearing
#1
Thread Starter
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Single Speed Gearing
So, I got a Globe Roll 1. Love it. Super simple, hard to steal parts, low maintenance. Its a single speed with a 42t chain ring up front, and a 17t rear. Problem is, there is this mile long mankiller of a hill on my way back home. Is it possible to gear it a little better for my environment? I live sort of in the foothills, where nothing is really flat. The bike is great for all of my commuting needs, except the mankiller. And no, I don't want to buy a bike with a derailleur.
#3
Check out this link to see what different gearing options would do for you.
https://www.bikecalc.com/speed_at_cadence
Here's another good resource that includes some charts to help you figure out what gearing you'd need for a given incline.
https://www.kenkifer.com/bikepages/touring/gears.htm
https://www.bikecalc.com/speed_at_cadence
Here's another good resource that includes some charts to help you figure out what gearing you'd need for a given incline.
https://www.kenkifer.com/bikepages/touring/gears.htm
#8
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"When I hear another express an opinion, which is not mine, I say to myself, He has a right to his opinion, as I to mine; why should I question it. His error does me no injury, and shall I become a Don Quixot to bring all men by force of argument, to one opinion? If a fact be misstated, it is probable he is gratified by a belief of it, and I have no right to deprive him of the gratification."
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Last edited by bhchdh; 03-19-10 at 07:03 PM.
#9
Right now you're at about 65 gear inches, which is pretty low already. You can try an 18t freewheel, but I think any lower gear and you won't be able to get anywhere very fast unless you're a real fast spinner
#11
ride for a change
Joined: Nov 2006
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From: Minneapolis, MN
Bikes: Surly Cross-check & Moonlander, Pivot Mach 429, Ted Wojcik Sof-Trac, Ridley Orion. Santa Cruz Stigmata
The good news is it isn't a big investment to try it. 42-17 is a pretty low gear already, freewheels are cheap, $20 or so, they're easy to swap, the tool is like $5. I have a surly set and formula set and you could run them flip flop with freewheels on both side. I say try the 18 you should be able to do it with no worries about chain length. I think that's a pretty small gear for the flats, but if it's rolling everywhere you go it might be just the ticket for you.
#12
nashcommguy
Joined: Feb 2006
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From: nashville, tn
Bikes: Commuters: Fuji Delray road, Fuji Discovery mtb...Touring: Softride Traveler...Road: C-dale SR300
So, I got a Globe Roll 1. Love it. Super simple, hard to steal parts, low maintenance. Its a single speed with a 42t chain ring up front, and a 17t rear. Problem is, there is this mile long mankiller of a hill on my way back home. Is it possible to gear it a little better for my environment? I live sort of in the foothills, where nothing is really flat. The bike is great for all of my commuting needs, except the mankiller. And no, I don't want to buy a bike with a derailleur.
https://www.schlumpf.ch/sd_engl_technische_daten.htm
#13
Prefers Cicero

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From: Toronto
Bikes: 1984 Trek 520; 2007 Bike Friday NWT; misc others
If you also have a geared bike or can borrow one of similar design to your SS bike, try riding up the hill and experimenting with the gears until you find the highest gear that still makes the hill acceptible. Check what gear combination you are using and divide the rear gear by the front ring and multiple the result by "the anwer to everything" (42) and that will tell you what rear cog you need to put on your SS. So if you find it is okay to ride up the hill using a 39 chain ring and an 18 cog, then (18/39)*42=19 - you need to put a 19 cog on the rear of your SS.
If the test bike has different length crank arms from your SS, (for example 170 mm VS 165 mm) it slightly alters the calculation, but only by about 1/2 a cog tooth.
If the test bike has different length crank arms from your SS, (for example 170 mm VS 165 mm) it slightly alters the calculation, but only by about 1/2 a cog tooth.
Last edited by cooker; 03-20-10 at 10:12 AM.
#14
I used to feel that way about the two hills on my commute, but i've suffered through them countless times and now they're a piece of cake... mostly. I'm running a 67GI, so its not much more than what you are. My advice is try to get some good momentum and a steady cadence just before you start up on the hill, and GOOD LUCK.
#15
Prefers Cicero

Joined: Jul 2005
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From: Toronto
Bikes: 1984 Trek 520; 2007 Bike Friday NWT; misc others
When I started commuting I was really out of shape and there was one fairly short hill of only about 200 m that I couldn't bike all the way up in my lowest gear. Now I ride up it effortlessly, but every year, usually around May, I see a few newbie commuters walking the last few meters.
#16
Not a legend
Joined: Oct 2005
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From: San Diego
Assuming you're just against derailleurs and not gears in general, you could always go for an internally geared hub. Not to mention--if you wanted to go this way--there's a three speed fixed gear from Sturmey-Archer out now. Sram has at least one hub gearset that switches from fixed to free with a few wrench/screwdriver turns (I forget which).
#17
When I started commuting I was really out of shape and there was one fairly short hill of only about 200 m that I couldn't bike all the way up in my lowest gear. Now I ride up it effortlessly, but every year, usually around May, I see a few newbie commuters walking the last few meters.
Lame advice
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This is Africa, 1943. War spits out its violence overhead and the sandy graveyard swallows it up. Her name is King Nine, B-25, medium bomber, Twelfth Air Force. On a hot, still morning she took off from Tunisia to bomb the southern tip of Italy. An errant piece of flak tore a hole in a wing tank and, like a wounded bird, this is where she landed, not to return on this day, or any other day.







