Have questions or want to discuss cycling? Join Now or Sign In to participate in the BikeRide community.

New: Take part in the September Giveaway for the Phantom XR electric bicycle from Life EV


33T single speed crank?
#1
I saw this seller selling these single speed cranks on Ebay as per link below.

http://www.ebay.co.uk/itm/ALLOY-SINGLE-SPEED-BIKE-CRANKSET-SINGLE-3-32-CHAINSET-SQUARE-TAPER-FIT-CRANK-/281229806590?pt=UK_sportsleisure_cycling_bikeparts_SR&var=&hash=item417a9a4bfe

How do you go about choosing the correct number of teeth crank for your bike? Also why is he selling a 33t crank? Aren't cranks supposed to have an even number of teeth?

Thanks
  Reply
#2
The number of teeth on the chainring divided by the number of teeth on the cog at the back provides the gear ratio. There can be any integer number of teeth on either above some minimum; which around 9 teeth. Practical considerations push the minimum number of teeth higher. Even or odd does not matter. A common road double combination is 53 & 39 for an example.

Why 33T? - someone wanted it, and thought that there was sufficient market to offer more. Could be for BMX application.

Choosing - depends on fast you pedal, your strength to mass ratio, need for climbing, outside diameter of your drive tire. Here is a calculator: http://www.bikecalc.com/cadence_at_speed

You still have to determine your strength, need for climbing, etc.
Nigel
  Reply


Possibly Related Threads...
Thread
Author
Replies
Views
Last Post

Forum Jump:

[-]
10 Latest Posts
Bike shop labor charges
Today 08:03 PM
Interesting Discovery - Electric Fatbike
Today 12:31 AM
Modifying your eBike
Today 12:22 AM
Best continent for cycle touring? ...Eur...
Yesterday 09:50 AM
What's the deal with hybrid bikes?
Yesterday 09:47 AM
Mechanical "locking" sound and there's r...
Yesterday 09:45 AM
Unknown bike
Yesterday 05:49 AM
New Member
Yesterday 05:34 AM
Upgrading from 10 to 11 Speed...New Shif...
Yesterday 04:05 AM
Saronni Colnago Critrium Frame set
Yesterday 12:50 AM

[-]
Join BikeRide on Strava
Feel free to join if you are on Strava: www.strava.com/clubs/bikeridecom

[-]
Top 5 Posters This Month
no avatar 1. ReapThaWhirlwind
23 posts
no avatar 2. Criminal
14 posts
no avatar 3. Jason @ect
10 posts
no avatar 4. Jesper
8 posts
no avatar 5. Ride with Me
6 posts