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Chainrings 2X1 Commuter Bicycle Part 2 Bike Blogger

2,301 views · Published 6 February 2016 · 4:57 · Indexed 6 November 2026

Channel: BikeBlogger · 2016 · People & Blogs

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When selecting chainrings for a 2x1 bike you need to consider not only the size of the chainrings but the difference between the sizes.

To shift between chainrings you need a front derailleur. These mechanisms are designed for certain size chainrings.

Check the manufacturer's literature for available chainrings used with the crank typically paired with the front derailleur you want to use to get a good idea of your options. This is not a hard rule though, although always more critical with the large chainring, and less important for the small chainring when not using multiple rear gears.

There is also a maximum front chainring tooth difference allowable i.e. 15 teeth or 20 teeth maximum difference between small chainring and large chainring.

Longer chainring bolts are used to install multiple chainrings on a bike, in contrast to the shorter bolts for single ring setups. Tighten the chainring bolts in a star pattern.

Another important measurement for selecting chainrings is to idenitfy the bolt circle diameter of chainring used on your bike currently. This BCD value must be the same for the new chainrings to match your crank.

Video - How To Determine Bicycle Chainring BCD Size Bike Blogger
https://www.youtube.com/watch?v=FmMX1yFxGTc

Playlist - 2X1 Speed Commuter Bike Project
https://www.youtube.com/playlist?list=PLEZf1_jDCYJ3E-G7vG7nky6GnxGoZ98nz

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