November 28, 20187 yr Hi all, I've had my ebike serviced today (5000 miles and going strong ), and the mechanic reckons I might need to source a replacement freehub before too much longer. Does anyone know what would be compatible with the Q128C please?
November 28, 20187 yr Any 9 speed mtb or road one will do the job which has the standard splines/key way fitting. Sram PG50. Shimano HG50 , HG200 - 400. Shimano MTB like M770 etc, Deore/XT. Sunrace cassettes. All will fit just depends on how much you want to spend and gearing needed. https://www.ebay.co.uk/itm/Shimano-Alivio-Sora-HG400-9-Speed-MTB-Cassette-11-36/311921196930?epid=21005862097&hash=item489ff3bf82:g:xisAAOSwOgdYwnD8:rk:6:pf:0 https://www.ebay.co.uk/itm/New-Sram-Powerglide-PG-950-9-Speed-Cassette-11-32T-For-MTB-Road-Bike/273247460391?epid=1905387655&hash=item3f9ed15c27:g:RDMAAOSw1-5bEBhE:rk:9:pf:0 https://www.ebay.co.uk/itm/New-Sram-Powerglide-PG-950-9-Speed-Cassette-11-32T-For-MTB-Road-Bike/273247460391?epid=1905387655&hash=item3f9ed15c27:g:RDMAAOSw1-5bEBhE:rk:9:pf:0 https://www.ebay.co.uk/itm/SRAM-PG-950-PowerGlide-Road-Bike-Cassette-9-Speed-11-32/223219083765?_trkparms=aid=555017&algo=PL.CASSINI&ao=1&asc=20170912102133&meid=d5fb8a528ccc4fc19c1e3c6234e2f7e1&pid=100754&rk=1&rkt=1&&itm=223219083765&_trksid=p2045573.c100754.m4842 Edited November 28, 20187 yr by Nealh
November 28, 20187 yr Author Any 9 speed mtb or road one will do the job which has the standard splines/key way fitting. Sram PG50. Shimano HG50 , HG200 - 400. Shimano MTB like M770 etc, Deore/XT. Sunrace cassettes. All will fit just depends on how much you want to spend and gearing needed. Ah that's great to hear, thank you.
November 28, 20187 yr Author Ah that's great to hear, thank you. Whoops, spoke too soon. Those links are all cassettes, I was asking about the freehub body. How easily can replacements for that be obtained?
November 28, 20187 yr My bad didn't read proper. I wasn't able to remove the freehub body from my Q128C but ex member d8veh said it was easy. No matter what I couldn't budge it !!! My guess it will be a fairly std part. Edited November 28, 20187 yr by Nealh
November 28, 20187 yr AFAIK no spares are available for Q motors, but that dosn't mean it is unrepairable. It may mean a strip down of your motor, but I'm pretty sure parts could be found from Shimano or Sram to fix.
November 28, 20187 yr Author Thanks Nealh, I've seen the thread where you and D8veh talked about that. I hope I have an easier time when it finally comes to it. And thanks too wheeliepete, let's hope you're right about compatibility
October 10, 20196 yr Author Hi again, resurrecting this post. After 10,000 miles of faithful service the freehub on my Q128C finally gave up the ghost a couple of weeks ago. Long story, but my LBS mechanic has managed to remove it - unlike other posters, who say it just slides off, this one was actually screwed to the motor body - hence no amount of pulling was ever going to get it off. Mechanic says it's like nothing he's ever seen before - I've posted his photos of it. Does anyone recognise this, and if so can they suggest where we might source a replacement? Someone elsewhere has suggested it might be a Bafang freehub?
October 10, 20196 yr Good job Barod, having tried twice I hadn't figured it was threaded. Do yo know how easily the lbs managed to remove it ? I haven't actually looked to deep in the freehub body but assume there must be an Allen key socket in there for a 10 or12 mm key ? Some here on SJS though thread dia looks too small. https://www.sjscycles.co.uk/shimano-freehub-bodies/ Edited October 10, 20196 yr by Nealh
October 10, 20196 yr My Bafang cassette freehub body simply slides off . The Q's are clones or the real deal form Aikema so the threaded option may be an in house design and machined by AKM. Edited October 10, 20196 yr by Nealh
October 10, 20196 yr Why do you want to replace it? What's actually wrong with it? You can buy a complete motor from BMSbattery and swap the side-plate - $157.28 inc shipping. .
October 11, 20196 yr Author Thanks for the quick replies. Leaving aside the cost consideration of a buying a new motor just because the freehub is shot, I generally prefer to repair rather than replace (e.g. inner tubes) Nealh, the LBS told me they blowtorched the area (from the inside of the cover, once they'd got it off - which was after they'd fab'd a lever for the job, and it still took 2 of them to get it off) before it unscrewed, but it came off with the same 2-pronged tool that you use to take out the bearings and service/ replace them. Good point about AKM in house design - i'll get in touch and see it they can ship any separately. Otherwise (failing the final option of a new motor) it's going to be a question of doing as much as possible with the pawls and bearings to keep the freehub going - it's developed a nasty tendency of skipping/ slipping, which isn't nice when it happens as you're pulling away at traffic lights or junctions
October 11, 20196 yr Last time I looked prices up a bit now $200/£151 inc delivery. It's changed then. The price I mentioned is the latest.
October 11, 20196 yr Thanks for the quick replies. Leaving aside the cost consideration of a buying a new motor just because the freehub is shot, I generally prefer to repair rather than replace (e.g. inner tubes) Nealh, the LBS told me they blowtorched the area (from the inside of the cover, once they'd got it off - which was after they'd fab'd a lever for the job, and it still took 2 of them to get it off) before it unscrewed, but it came off with the same 2-pronged tool that you use to take out the bearings and service/ replace them. Good point about AKM in house design - i'll get in touch and see it they can ship any separately. Otherwise (failing the final option of a new motor) it's going to be a question of doing as much as possible with the pawls and bearings to keep the freehub going - it's developed a nasty tendency of skipping/ slipping, which isn't nice when it happens as you're pulling away at traffic lights or junctions I haven't had any problems with my Q128C, but I know other cassette motors gave the problem you described. In them, it was caused by rust, which stopped the pawls moving properly. A squirt of 3-in-1 fixed them. Are your pawls damaged.
October 11, 20196 yr Author I haven't had any problems with my Q128C, but I know other cassette motors gave the problem you described. In them, it was caused by rust, which stopped the pawls moving properly. A squirt of 3-in-1 fixed them. Are your pawls damaged. The original problem was the freehub seizing briefly (so that it didn't coast properly), which I think is an issue that others have had. A bit of TLC and that was rectified for a while at least. However a couple of weeks ago it went the other way and lost all drive - the pedals were spinning madly, but the hub wasn't engaging. My LBS mechanic gave it a good servicing (see pictures of the state it was in when he did so), but it's wearing out and needs replacement - for example the bearing race isn't in a very good state. Pawls can be replaced, but i'm told they're not all the same (as with so much in the bike industry), so it can be trial and error to find some that would be OK. I've sent a message to Aikema to see whether they can supply a freehub on its own, but I've also spotted this on greenbikekit, which looks remarkably similar: https://www.greenbikekit.com/bafang-fatbike-rmg06-motor-cover-with-cassette-base.html I might give that a go - it would be cheaper than buying a whole new motor.
October 11, 20196 yr TBK state they can order parts for the AKM motors. http://www.topbikekit.com/akm128cst-48v500w-rear-driving-hub-motor-cassette-motor-for-ebike-p-723.html
October 11, 20196 yr Yes I did, the lcd4 might appeal for a less cluttered cockpit though for me I like to have my voltage and watts viewable. Also that dinky 2.1kg cst hub with int sinewave controller, a bit pricey though at $299 + $$$ extra for lcd option. 210, 225 & 250rpm versions. These guys have really upped their game of late and sure look better then BMSB now.
October 11, 20196 yr Yes I did, the lcd4 might appeal for a less cluttered cockpit though for me I like to have my voltage and watts viewable. Also that dinky 2.1kg cst hub with int sinewave controller, a bit pricey though at $299 + $$$ extra for lcd option. 210, 225 & 250rpm versions. These guys have really upped their game of late and sure look better then BMSB now. That's a Kede motor. I keep looking at them, but there have been a lot of reliability issues. Also, they have a temperature sensor in them that cuts the power right down every time you go up a hill! The Neomouvs at the bike show had the new tiny Bafang cassette motors in them. I haven't see any of the resellers selling that motor yet. I keep looking.
October 11, 20196 yr TBK is now a really proper one stop shop for all kit needs now, loads on offer. Good selection of AKM hubs and the AKM bbs clone as well as the usual mid drives. Controllers as well. BMS galore with many options and also batteries, looks like the Panny 3200mh BD is their flavour of the month at the mo and from what I read a very good 10a one.
October 16, 20196 yr Author So, I'm really happy to report that, following a recommendation above, I got in touch with Topbikekit to see whether they could order this part from AKM. And indeed they can! I sent them photos of what I was after, they got onto AKM and came back really quickly with the offer of a motor cover and freehub (see photo) for 13USD each, plus shipping. Result!! 34.jpg (205.37 KiB) Not viewed yet They did also point out the difficulty of removing the motor cover, and I was able to assure them that I knew about that, but the problem had been overcome thanks to the mechanic in my LBS. All being well a couple of these parts will be arriving with me soon (seemed worth doubling up, when the shipping was 28USD ) and I look forward to the resumption of trouble-free ebiking soon. Anyone else in the same predicament as me and who doesn't want to splash out on a while new motor, I highly recommend TBK, they seem great.
October 16, 20196 yr Glad to hear they were able to sort you out, it's good to know there is a source of spares for these motors. Looks like TBK could now be providing the service that BMS Battery should of been for years. Edited October 16, 20196 yr by wheeliepete
October 16, 20196 yr Author Glad to hear they were able to sort you out, it's good to know there is a source of spares for these motors. Looks like TBK should now be providing the service that BMS Battery should of been for years. Indeed! Will reserve final judgement until they arrive, but assuming that all goes ok then they deserve to get more trade for this
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