How do I choose a fixie crank?

As a general rule of thumb, you should go up by 1 chainring tooth for every extra 2.5MM of chainring length, and down 1 tooth for every 2.5mm reduction in crank length. So if you were riding a 50X15 on 170 cranks, and you go down to 165 cranks, you should go down to a 48 in the front, and keep the 15 in the back.

How do I know what size crankset to buy?

How to measure crank length? Crank length is measured from the centre of the bottom bracket axle to the centre of the pedal axle. If you’re not sure what length the cranks on your bike are, the quickest way of finding out is typically to just look at the backside of your cranks, just below the pedal axle.

Are cranks speed specific?

Yes, chains are #speeds specific.

What’s the difference between 170mm and 175mm cranks?

Still though, the difference between 170 mm and 175mm is less than 3% and leg lengths of bike riders vary by far more than that. There is a school of thought, particularly in the United States, which suggests that crank length should be proportionate to leg length.

What size crank length do I need?

Leg Length Measurement

Crank Length(mm) Inseam(cm) Height, Male and Female*
162.5 77 Up to 166.3 cm Up to 5′ 5″
170 81 – 83.5 173 – 179 cm 5′ 8″ – 5′ 10½”
172.5 83.5 – 86 179 – 185.5 cm 5′ 10½” – 6′ 1″
175 86 – 89.5 185.5 – 192 cm 6′ 1″ – 6′ 3½”

How many teeth do you need for a single speed crankset?

Here’s what you need to know: A gear ratio is determined by the number of teeth you have in the chain ring and the rear cog. We personally recommend riding a fixed gear or single speed bike with either 44 or 46 teeth in the chain ring (hence the first number in the gear ratio) and a rear cog with 16 teeth.

Can you use any crankset on a bike?

Many chainrings are not compatible across different brands or even across different models for any given brand. Cranksets attach to a frame via bottom bracket, and there are many different types of bottom brackets.