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Hi. Forgive me for talking ebike, however does any one know if its simple to order a new emtbike with say 9 speed 36t cassette and upgrade it to a 9 speed 40 or 50t cassette if such exists? I'm looking at this because all the 11 and 12 Spd bikes appear to have been sold and there's the odd 9 speed around but with 36t cassettes
If you go that much bigger, you may find you need a new mech with a longer cage, at which point you may as well get an 11/12 speed set up, if you really feel you need a 50t cassette, with electric assistance...
honestly... unless you plan on riding up a vertical wall, I can't see ANY need for an ebike to have a 50t cassette!!
My GFs cassette weighs a tonne, and she probably only uses the highest 3 gears~!!!!
DrP
Should be the same as analogue bikes surely?
So fairly straight forward, though you may need a new rear mech to deal with the increased range?
Edit, but yes as the poster above says, not sure why you'd need a 50t cassette though.
Most 9 speed mechs will only handle a 36 sprocket at most - you might be able to get away with a 40 with an extended mount, but at the loss of small sprocket capability
9 speed available tech is your limiting factor.
What size is the chainring? What BCD is the chainset. There might be capacity to reduce the size of the chainring.
Never ridden an eMTB so no idea if you’d need such a big gear. Seems unlikely unless this is sorting a bike for someone with significant physical difficulties riding very lumpy terrain. Remember, with a bigger top top end comes bigger jumps between sprockets which will be exaggerated further on a 9spd.
if you really feel you need a 50t cassette, with electric assistance…
I can’t see ANY need for an ebike to have a 50t cassette!!
not sure why you’d need a 50t cassette though.
Try riding one off road and you'll find out why...
As above, 9sp usually is 36t maximum, you could get 40/42t with an extender.
Try riding one off road and you’ll find out why…
I have been for 4.5 years. I can’t see the need for 50t. 42t for stupid steep stuff, or if you want to maintain a cadence when riding with non ebikes, but I’d never need a 50t cog.
Maybe if you were planning on riding it with the motor off/out of juice?
Try riding one off road and you’ll find out why…
Genuine question, care to explain why?
I've ridden a 50t on an analogue bike and felt like I could climb pretty much anything. That and a motor would seem overkill for all but a few very niche needs.
Quite a few eBikers are lazy. Obviously...
And quite a few are not quite so lazy but like climbing or attempting to climb some pretty steep, gnarly stuff. Just because they can. Or think they can, which is much funnier for the spectators.
And sometimes you get 3/4 of the way up to the top of BPW and run out of juice. Then it's a 25KG clockwork bike and the low gearing is most welcome.
I don't use the 51T often, but I have used used it and welcomed it.
Yeah 51 tooth (or maybe 46 might also be OK) is needed for those times when you run out of juice, or you want to ride without motor assistance occasionally.
Yeah 51 tooth (or maybe 46 might also be OK) is needed for those times when you run out of juice, or you want to ride without motor assistance occasionally.
I can count the number of times that has happened on my dorsal fins.
I can count the number of times that has happened on my dorsal fins.
I usually do the first hill of every ride without the motor, to warm up and to try not to lose all semblance of fitness. But only because I'm usually the only ebike on a ride, if I was with solely ebikes we'd just whack in turbo.
I'd quite like to convert our ebike to 9 speed!
DrP
I find the 50 tooth comes in handy for longer low grip steep climbs where you want to keep the cadence up and the power delivery smooth without too much torque to make the rear wheel spin out.