Specifically a 2019 Giant Fathom which was my neighbours mtb until he upgraded and sold it to my my wife for commuting duties. Different tyres, mudguards, a rack and a raised stem and she loves it but wants higher gearing.
According to this the current chainring is a Forged Alloy minimal Q-factor, 36T Steel Direct Mount ring. At a quick glance I'm not sure it's even possible to change it so thought I'd ask on here. Not familiar with direct mount. Thanks.
Edit: bit of reading says of course it's possible. So how big to go? How big will fit?
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E-bike chainrings have splined fittings generally unique to the motor - you need to ask a Giant dealer if spares are available. Removal is using a bearing puller. It’s worth mentioning that E-bikes are more efficient when pedalled quickly, rather than grinding out a big gear, plus a bigger chainring won’t make it go faster as you just hit the limiter
Thanks. Managed to get it apart and now searching for a replacement chainring, or a suitable spider (28 splines) and standard ring, taking (3mm?) offset into account.
Not wanting to go any faster but at the moment she's in top gear uphill and down and all that torque on the smallest cog can't be good.
The limiter is set by a sensor on the rear wheel, so shouldn't be affected by the cadence of the cranks, as you say.
Forgive me if your wife is an accomplished rider but, it sounds a bit like she is grinding out the speed in top gear and reaching the cut off on the motor, as 36/11 is only about 60 rpm to get 16 to 17 mph and past the limit for standard bikes.
Could it be that her perception of needing to go faster is because she has hit the (so feeling) wall when assistance stops, rather than spinning her legs too quickly?
According to the link you posted, its a Praxis Works (though hard to tell if thats right from the actual photo). Upgrade Bikes are the Praxis importers
https://www.upgradebikes.co.uk/Catalogue/Praxis/Praxis-Range
Also, what twonks said - if emtb being used on the road, probably running out of assistance at least half the time. Relax n go slower is the best way 😊
Lol. Accomplished, yes. Impatient, yes. Wanting to go faster than the limit, no, but using the full range of the rear cassette will stop her wearing out the smallest cog, hence wanting to put a bigger ring on the front. Have I got that right?
Spose the answer is 'it depends'
I'd be tempted to try and get her spinning faster first, so she could actually use a lower gear to hit the limit and make it easier on the motor, gears and her legs.
If she really wants to spin at a low cadence then putting a bigger chainwheel on will allow for turning her legs slowly in a lower gear, so yes that will achieve what you want.
I think it’s a good idea if it will fit. Praxis are terrible with supplying Upgrade though. I’ve been waiting for 160 Spesh KSL cranks since late last year.
Riding lots in the 11 or 12 must wear it fast. Inevitable
I’d do it but mine is stuck with 32 unless you ditch the chain-guide and even a 34 is max. KSL. I’m immersion waxing to try increase cassette life. Man they are expensive these days.
I have a Giant Explore and reduced the front ring - I only ever use it for touring with a tent etc and I have a dodgy knee. I fitted a an Uber bike ring with the correct BCD. Not complicated and I managed to fit it without removing the cranks or the spider. Can't see a problem, going up a ring size?
Trust me, it doesn't need bigger than a 36 on the front unless deristricted.
And there's no way she should be going everywhere in top gear, that a sure fire way to screw the motor, never mind the smallest sprocket.
