handlebars on fixed and track bikes

[Origamist]

and how do you convert between "inches" (which i don't understand) and ratios (which I do understand) like 42x17?

You can use this to work out your GI ratios:

http://software.bareknucklebrigade.com/rabbit.applet.html

 

[Andy Pandy]

Sorry to come to these discussions a bit late, but I have just upgraded my on-one track wheels to miche hubs on open pro's, as I knackered my back wheel. The miche hub is a step up from the on-one hub, IMHO. I steered away from deep v rims as they all seemed to be heavy and weak (unless you spend big bucks, and here my LBS warned me that they can be a little fragile). When commuting fixed your wheels take a lot more abuse than when on a freewheel, therefore you need a rim that will stand up to it. I don't think many of the fashion rims will do that.

Oh, and 42x17 is a girly gear, 48x17 at least!

 

[Greenbank]

70"-75" for London commuting. Once you're used to it there will be no hills in London you can't get up with that gear.

Below that (63"-69") for hillier terrain (Bath, Bristol, Sheffield, etc).
Above that (75"+) for flatter terrain or if you prefer pushing big gears slowly.

Other than that it's all down to personal preference.

Gear Inches can be calculated using Sheldon's site:-

http://www.sheldonbrown.com/gears/

Select the right tyre size/width for a more accurate Gear Inch calculation:- 46x17 on 700c x 25mm tyres = 71.4"

I use that same gear on long rides (200km+ Audaxing) through various lumpy places with not much problem.

 

[Joe24]

Anyone know the website for calculating your cadence? I think you put in your chain ring size and sprocket size and speed and it worked it out.
I lost the address when the bookmarks were deleted

 

[Greenbank]

Anyone know the website for calculating your cadence? I think you put in your chain ring size and sprocket size and speed and it worked it out.
I lost the address when the bookmarks were deleted

Sheldon's gear calculator will do that.

Put in chain ring size, sprocket size, tyre width/size and then select mph (or kph) at 100 rpm. Scale accordingly.

So 46x17 on 700c x 25mm tyres doing 100rpm is 34.2kph.

So 57.8kph (my top speed on that gear) would be 100*57.8/34.2 = 169rpm

180rpm would be 180*34.2/100 = 61.56kph.

 

[kyuss]

This one looks easier to use.

http://software.bareknucklebrigade.c...it.applet.html

 

[Joe24]

This one looks easier to use.

http://software.bareknucklebrigade.c...it.applet.html

Cheers, thats a good site, shows where the skid patches would be aswell
I looked at the Sheldon one, but i wanted to know how fast i would need to go to be getting really high RPM's.

 

[zimzum42]

It's good that you're thinking of coming over to the right side, but please don't get a Langster!

Get something decent!!!!!!

 

[Joe24]

It's good that you're thinking of coming over to the right side, but please don't get a Langster!

Get something decent!!!!!!

+1

 

[Tharg2007]

It's good that you're thinking of coming over to the right side, but please don't get a Langster!

Get something decent!!!!!!

+2
common as muck too