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What ratios or tooth counts...(14 posts)

What ratios or tooth counts...spluti
Oct 14, 2003 9:48 AM
are you fixie guys using?
I'm thinking 53/16 for moderate terrain in city riding. How does that sound for starters?
Uhh, do you ride that now on your geared bike? nmSpunout
Oct 14, 2003 9:50 AM
Yes, maybe more 53/18..spluti
Oct 14, 2003 10:02 AM
I don't spend much time with my small ring. I'm just wondering what would be a good sarting place.
53/16 sounds brutal to me.....Steve Young
Oct 14, 2003 10:00 AM
I'm new to fixed but I just ordered an 18 tooth cog to go with my 48 tooth chainring as I was finding that a little tall.

My riding is all on fairly flat routes with few corners or stops etc. I would characterise it as "easy" urban riding.

I might be soft (but I do ride 100-150 miles a week on different bikes) and if I was going to be doing moderate city riding I'd be thinking of a 46/18 or a 44/18.

I guess it all depends on your definition of moderate vs the durability of your knees and the strength of your legs.

The fixed forum is really good for these sort of questions - lots of experienced people there.

Steve
I use 44x16 on my surly fixie with 165 cranks but.........abicirider
Oct 14, 2003 10:03 AM
I am a very short male only 5'5" and ride a 50cm bike I have experimented from 50-42 in the front 16 is good for me in the rear the ideal behind fixie is you want to spin in my thinking just my opinion 53 is too big just my thought.
Be Safe Out On The Roads!!!!!
Ray Still
same here: 44x16 on my fixie with 170 crankslaffeaux
Oct 14, 2003 1:15 PM
I ride where it's pretty flat and use a 44x16. I don't plan on riding many long hills with this gearing.
It would ripe my knees off... I'm using 44/18 on my fixie...PdxMark
Oct 14, 2003 10:13 AM
which I switched to after 48/19 was too hard on my knees. With the 44/18 my knees are happy and I've ridden a 450 mile one-week tour, with one century day and one day with 7500' of climbing.

It's not the city cruising that will be hard, it will be starting from stops that will hurt you with that gearing - it would hurt me, anyway. Common used gearing is 42/16 or 42/17.... (my 44/18 is close to 42/17).
re: What ratios or tooth counts...KEN2
Oct 14, 2003 10:15 AM
You're fixin' to have a painful time starting up at stoplights (you mention city riding). I run 46/16 for flat to rolling terrain where it's wide open, i.e. minimal stopping. I can spin out to around 35-36 mph downhill and still climb acceptably. YMMV

Why not just choose a gear on your regular bike and ride around without shifting? You'll soon find out what works before you invest in chainring/cog for a fixie.
That's pretty tall ...Humma Hah
Oct 14, 2003 10:43 AM
2.94:1 is a good gear for a velodrome, but a bit on the steep side for any place that's not dead flat.

I personally run a steeper gearing than most fixte riders like, recently doing 100 miles of rolling countryside at 48:17 (2.82:1). I'm a masher ... most riders are spinners and would want a lower gearing. With my gearing that tall, I have little ability to brake by resisting my pedals, so I rely heavily on my brakes to slow me down.

A good starting point (and this has been true for about 120 years) is 2.5:1. That would require a 53:21 gearing if you keep your present chainring, and I think you'll have a hard time finding a rear cog with that many teeth. With your present 16-tooth rear, a 42-tooth front would probably be a good choice.
way too tallDougSloan
Oct 14, 2003 10:46 AM
You'll wince about the 3rd time you pull away from a stop or climb a hill.

Try to gear so that you are spinning 90-100 rpms at your cruise speed, but still low enough to get up any hill without mashing too hard.

I use a 48x18 usually (100 rpms @ 21 mph), but when in really good shape, a 16 or 17.

Here's a chart so that you can play with some numbers:

http://www.midcalracing.com/gears.xls
way too tallHumma Hah
Oct 14, 2003 10:50 AM
too big for me - I use 42x15 and spin about 85 rpmdzrider
Oct 14, 2003 11:48 AM
If I lose some weight I may go to 42x14 but can't picture myself going bigger than that. I hate having to work too long to get up to speed.
It's official...I'm a "spinner"...biknben
Oct 14, 2003 12:31 PM
All this talk of such big gears makes my knees hurt. I'm at the other end of the scale. I've been SSing the last few days with a 42x18. I don't like slogging up a hill in a low gear.

When fixed I'll run a 42x16 so I don't spin out so quickly.
53/16 = 23 mph at 90 rpm. You da man! (nm)Kerry Irons
Oct 14, 2003 4:31 PM