ebike mtb 1by9

[Gordonhooker]

Hi All,

I looking for chain ring suggestions for converting my cannondale mtb converted to ebike - change from 3by9 to 1by9 - What chain ring size give me the most scope?

[bychosis]

What cassette size do you have? What wheel diameter and tyre size? And do you want more top speed or low speed climbing ability.

I have several (non-e) bikes converted to 1x. Bought narrow wide rings in 30,32 and 36 I think. Put a 36t on 1x11 with 11-42 (11spd) cassette, 26” wheels. Put 32tooth on my son’s 26” with 11-34 9spd cassette, it was 30tooth until he got a bit stronger. Latest build is a 32 on 11-34 9spd 29”. All built for decent climbing, but maxxing out cadence descending hills. Normally in top gear at a comfortably fast pace on the flat.

[Gordonhooker]

What cassette size do you have? What wheel diameter and tyre size? And do you want more top speed or low speed climbing ability.

I have several (non-e) bikes converted to 1x. Bought narrow wide rings in 30,32 and 36 I think. Put a 36t on 1x11 with 11-42 (11spd) cassette, 26” wheels. Put 32tooth on my son’s 26” with 11-34 9spd cassette, it was 30tooth until he got a bit stronger. Latest build is a 32 on 11-34 9spd 29”. All built for decent climbing, but maxxing out cadence descending hills. Normally in top gear at a comfortably fast pace on the flat.

Thanks for the response...

The wheel size is 27" and the rear cassette is an 11-? 9spd cassette. Because it is an ebike and currently on 5th and 6th gears on the centre ring is usable - the rest spin out.

[bychosis]

So you want a bigger chainring?

In the past I’ve made a spreadsheet to check gear ratios. Test ride the bike, see what gears I really use/need. Plug in some cog and chainring sizes and fiddle with the numbers to get a chainring size optimised to my preferences. It’s how I ended up with a 36tooth (26” wheels) when I went 1x11 from 3x9. (Wheel size affects the drive ratio -or gear inches)

There’s also online calculators available. Haven’t used this, but here’s one:
https://www.berkshiresports.org/bicycle ... alculator/