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Post by on Mar 28, 2023 16:12:14 GMT
Indeed. A LWB Chopper. By Cannondale.
What's not to like.
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Post by Aloysius on Mar 28, 2023 17:08:21 GMT
You can of course buy a chainring which comes with the central bit as well. The crucial bit of info is BCD which stands for Bolt Circle Diameter. Looking at that pic it seems unlikely that it would be possible to fit a crank motor to the front drive arrangement; the frame is going to get in the way. Given the unusual layout it would be entirely less problematic to use a hub motor, thus you can keep the existing drivetrain without mods. However, loads of space for the batt; a popular approach is to drill the frame and use rivnuts to enable the fixing. Fucking hell I want one. Sorry Martin I missed this as my phone jumped a page. Thanks for the observation about the crank motor getting in the way of the frame. So its a hub motor then. For the battery I will use Stauff clamps. Big fan of Stauff clamps. Hydraulic pipe clamps made of nylon which come in lots of different sizes. tube diameter about 50mm. Stauff clamps are very adaptable and the nylon parts can be drilled easily. steel bits each side are not fixed. I use a stauff clamp for mounting the motor on the floating electric beer drinking platform and also for clamping the solar panels to the tubular handrails on the country estate boat. Like stauff clamps a lot. Stauff clamps = Good Shit. Do you like Stauff clamps? One advantage of the rivnut idea is that it would make it impossible (well, very diffic) to remove the battery unless you have the key for the mounting arrangement. It may be possible to add a crank motor at the second chainring but I would go for a hub motor. Also it may be impossible to add a hub motor for the small front wheel but I'm not sure. Doesn't look big enough to me though. If you have a rear hub motor the handling will be like a motorbike and generally more predictable. So wheelies, exciting wheel slides etc. Front-wheel motors do wierd things.
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Post by on Mar 28, 2023 17:13:55 GMT
Yes I think I will probably go for rear hub motor.
20 inch.
There are some on fleabay which come from Kraut land but of course it is Chinese.
I was 48v as have already got the battery.
I'll clamp the battery on with big Danger Of Death stickers.
Front wheel is 16 inch but yes I expect it could get naughty.
The other option is to use a rc plane motor I had for an electric canoe as a friction drive.
I did also wonder about electric scooter wheel motor as friction drive onto the stern wheel. [br I'm not there yet with the jet or rocket propulsion solution.
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Post by Aloysius on Mar 28, 2023 18:16:51 GMT
Yes I think I will probably go for rear hub motor. 20 inch. There are some on fleabay which come from Kraut land but of course it is Chinese. I was 48v as have already got the battery. I'll clamp the battery on with big Danger Of Death stickers. Front wheel is 16 inch but yes I expect it could get naughty. The other option is to use a rc plane motor I had for an electric canoe as a friction drive. I did also wonder about electric scooter wheel motor as friction drive onto the stern wheel. [br I'm not there yet with the jet or rocket propulsion solution. Just bear in mind that the battery is made to be removable by the user on practically every ebike for a reason. But you're an adult so no more need be said. I expect you'll go for some Heath-Robinson arrangement anyway.
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Post by on Mar 28, 2023 18:22:26 GMT
The battery has its own mount with a key to unlock it. I am referring to clamping the mount itself to the frame not the battery.
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Post by Aloysius on Mar 28, 2023 18:29:59 GMT
It should make quite a good ebike. If you do go for the 750W motor it will be crazy fast.
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Post by on Mar 28, 2023 18:34:25 GMT
20 inch wheel is not going to be that fast with a hub motor. If I could get the Bafang BBS02 on the front end it would really shift. The centre chain ring does have some sort of bottom bracket arrangement but it is only one sided with a blanking cap on the other side. Don't really want to mess with that. 1kw hub motor seems to be around 480rpm which is 28mph so I suppose it isn't too bad. Probably don't want to exceed 30mph on a pedal cycle with standard equipment.. i suppose one of these is worth a go given I no longer have to pay for car unsurance. £230 is not terrible and I have the battery . www.ebay.co.uk/itm/194979535267
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Post by Aloysius on Mar 28, 2023 18:44:09 GMT
In any case, the drivechain that runs to the front crank would also foul the motor so without some very creative metalwork it ain't gonna happen.
You're limited to playing with gear ratios via the centre cog and the back; big at the front, small at the rear obvs. But the best bet is to to fit the hub motor and see how it is; you may well decide it's fast enough. Personally I would think anything over 20mph is going to be...thrilling. Hope the brakes work.
The middle crank is likely a tapered affair so even though it's one-sided, it is probable you could fit other rings.
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Post by Aloysius on Mar 28, 2023 18:46:54 GMT
When I was looking a lot at the details of these things I seem to recall that popular opinion has it that the 750W motor is more reliable. One thing more; the larger (and illegal) models are significantly larger than the ones the nanny state allows for; consider panniers. Dem cops ain't entirely dumb. When I rode m-bikes all the time, I was pulled a few times and it often turned out the copper was also a bike fan and knew his onions. In Lundinium this shit has been going on for a while and some of them will know what they're looking at, and you are not going to blend in so well on that thing. Or anyway.
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Post by on Mar 28, 2023 19:43:29 GMT
Good point. I'll keep away from dem rodes and do the riverside paths innit bro.
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Post by fi on Mar 28, 2023 19:53:24 GMT
Good point. I'll keep away from dem rodes and do the riverside paths innit bro. Hooligan towpath cyclists club www ._new_member _sign _up._co.uk
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Post by Aloysius on Mar 28, 2023 19:54:52 GMT
Good point. I'll keep away from dem rodes and do the riverside paths innit bro. Which raises another point...do you need in excess of 20mph on riverside paths? Stay safe bro.
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Post by on Mar 28, 2023 20:52:14 GMT
Good point. I'll keep away from dem rodes and do the riverside paths innit bro. Hooligan towpath cyclists club www ._new_member _sign _up._co.uk
Not talking towpaths I would never ride a bike on a towpath. Thame tideway riverside paths.
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Post by Aloysius on Mar 28, 2023 21:05:21 GMT
The cassette on that thing is mahoosive!
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Post by on Mar 28, 2023 21:26:17 GMT
If you mean the 20 inch hub motor I don't know but the dropout width is exactly what I have. 135mm. For this reason it seems ideal.
The Bent 2 (bike in question) has an 8 speed cassette on the stern end.
Someone did a very cool motorised version of this bike by constructing a flexible in line battery pack using 18650 dimensioned cells and slotting them inside the frame which is open at the stern as a mudguard. There is a foam bung in there.
This is actually an extremely clever system but way above my pay grade sadly.
I would if I could but no way can I get this level of competence.
Slightly boring but 4.08 on the video shows that this is an very clever bit of work.
I'd pay someone to do this if I have a job but I don't.
Does assume one can get the bike indoors which to be fair I can't so maybe a bit pointless.
Removable battery could work better here but still nice to see imaginative solutions.
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