I have a fixie and my cog sizing is...
Discussion
) also welcomed 
How do you mean "far too small"?
I run 42x15, have done for as long as I can remember, it's about 73 gear-inches IIRC. Great for pulling away from lights and general cruising, by no means a time-trialling gear though.
Use:
http://www.sheldonbrown.com/gears/
To have a look at various combinations for your gears. 70 gear inches is an "easy" gear to push, but you will find you spin out a little down steep hills.
I use Dura-Ace sprockets. They're only about a tenner each, and you don't need a whole range.
I run 42x15, have done for as long as I can remember, it's about 73 gear-inches IIRC. Great for pulling away from lights and general cruising, by no means a time-trialling gear though.
Use:
http://www.sheldonbrown.com/gears/
To have a look at various combinations for your gears. 70 gear inches is an "easy" gear to push, but you will find you spin out a little down steep hills.
I use Dura-Ace sprockets. They're only about a tenner each, and you don't need a whole range.
swerni said:
I'm running 44-16 as that's what came on the bike, had 32.4mph on it, didn't want to loo at the cadence 
It's tough up the hills, but I guess that's the point of a fixie
Christ that a Cadence of around 150! It feels like my legs are going to get ripped off when I go over 130 fixedIt's tough up the hills, but I guess that's the point of a fixie
Ummmm, not to sound rude but you want to increase the gearing so you are thinking of replacing the chain-ring rather than the fixed cog at the back???!!!!
Madness!
As someone already pointed out just buy a new cog for c.£10.
If I were you I would in fact buy two, a 14T and a 15T. Try both to find out which is comfortable.
In fact, I might have a spare of one or both at home (Dura Ace most likely). I will check tonight.
PM me if you are interested and I will happily mail it to you.
I ride 48:16 and very rarely spin-out. Works well for a flat 10 mile London commute.
Madness!
As someone already pointed out just buy a new cog for c.£10.
If I were you I would in fact buy two, a 14T and a 15T. Try both to find out which is comfortable.
In fact, I might have a spare of one or both at home (Dura Ace most likely). I will check tonight.
PM me if you are interested and I will happily mail it to you.
I ride 48:16 and very rarely spin-out. Works well for a flat 10 mile London commute.
walm said:
Ummmm, not to sound rude but you want to increase the gearing so you are thinking of replacing the chain-ring rather than the fixed cog at the back???!!!!
Madness!
As someone already pointed out just buy a new cog for c.£10.
If I were you I would in fact buy two, a 14T and a 15T. Try both to find out which is comfortable.
In fact, I might have a spare of one or both at home (Dura Ace most likely). I will check tonight.
PM me if you are interested and I will happily mail it to you.
I ride 48:16 and very rarely spin-out. Works well for a flat 10 mile London commute.
I hadn't really discounted changing the rear cog, just know that 42 on the front is small and so was tempted to go up to something like a 48 giving me 48x16 which seems to be what you use (I also do a flat London Commute). Haven't done the sums to work out which it's better to change. Thanks for the offer, will drop you a PM later.Madness!
As someone already pointed out just buy a new cog for c.£10.
If I were you I would in fact buy two, a 14T and a 15T. Try both to find out which is comfortable.
In fact, I might have a spare of one or both at home (Dura Ace most likely). I will check tonight.
PM me if you are interested and I will happily mail it to you.
I ride 48:16 and very rarely spin-out. Works well for a flat 10 mile London commute.
Oops, just noticed I wrote fixie (I actually use the single speed side, not the fixie)...
AyBee said:
Oops, just noticed I wrote fixie (I actually use the single speed side, not the fixie)...
Ah!That changes things. Makes much more sense, since freewheels are a lot rarer.
You can still find them, though...
You need a special tool to remove and install (which is another £15 or so) or just get the LBS to do it...
http://www.winstanleysbmx.com/product/43982/ACS_Cr...
http://www.winstanleysbmx.com/product/43984/ACS_Cr...
I am afraid I don't have any of those spare...
paulrockliffe said:
Dura-ace rear sprockets?
CRC do the MTB stuff for about £4 a cog, which I reckon would be a better bet - decent thickness piece of steel. Will weigh a couple of grams more, but will last forever.
Interesting - do you have a link?CRC do the MTB stuff for about £4 a cog, which I reckon would be a better bet - decent thickness piece of steel. Will weigh a couple of grams more, but will last forever.
The only ones I could find were set up to fit where the cassette usually goes which is what you need for a conversion not a pure fixie/SS.
For a THREADED sprocket - they seem a little pricier.
I generaly use 46 x 18 67.5" gear good for 4-40mph max on that three years ago 41mph @ 205rpm 
When I first started riding fixed I used to max around 130 rpm but you soon learn to twiddle, my commute involves a short hill so I get practise most mornings around the 160-180rpm range.
My other bikes are set higher with 46 x 17 72" gear and my TT bike on 48 x 13 = 97" but that is not for long hilly rides
When I first started riding fixed I used to max around 130 rpm but you soon learn to twiddle, my commute involves a short hill so I get practise most mornings around the 160-180rpm range.
My other bikes are set higher with 46 x 17 72" gear and my TT bike on 48 x 13 = 97" but that is not for long hilly rides
Gassing Station | Pedal Powered | Top of Page | What's New | My Stuff