Chainring selection

PB Forum :: Road Cycling and Touring
Chainring selection
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flag Armand74
Posted: Jan 20, 2022 at 22:14 Quote
Hello,

I am currently building a commuter bike based on a road bike frame. I have planned to recycle for the drivetrain some MTB components, namely the 11 speeds cassette (11-42) and the rear derailleur (XTR 11 speeds).

My question is regarding the front chainring. I’m currently using a Ultegra 50-34 crankset paired with a 11-34 cassette which is perfect.

I don’t know which chainring would be adequate for a 1-by configuration: a 48 teeth would be to much?

Thanks for the help,
Armand
flag adm750
Posted: Jan 21, 2022 at 6:09 Quote
Armand -
I built up a "gravel" bike off my old Rockhopper. I run a Microshift 1x10 with an 11-48 cassette and a 45T front chainring. I find that the combo gives me great range for climbing and for speed. but mine was built to ride more gravel pathways and tow-path type roads.....State park pathways, rails-to-trails type shit. I think I could easily use a 48T in my case, but I've been super pleased with the gearing as it is now.

Using the 11-42 you have and running a 48 front in your case doesn't seem out of scope at all, especially with the goal of commuting.

photo
flag BenLow2019
Posted: Jan 21, 2022 at 6:20 Quote
Use the bike gear calculator to get an idea.
You know what you have right now and you think it's perfect. Plug that into the calculator and get a shot of the ratios.
Then plug in the new cassette and mix in ideas for your chainring to get the ratio range that suits your riding preference.
https://www.bikecalc.com/gear_ratios

Good luck.
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