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 Post subject: Re:
PostPosted: Sun Nov 06, 2016 11:41 pm 
South West Deputy AEC
South West Deputy AEC
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Joined: Wed Jan 09, 2008 1:15 am
Posts: 2647
Location: DEVON
First test ride went well today! :lol: Covered about 7 miles of medium difficulty.

Notice how the battery only just fits into the wee frame - bit of a squeeze slotting it onto its mount.

:xmas-big-grin:


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 Post subject: Re:
PostPosted: Wed Mar 22, 2017 12:38 am 
South West Deputy AEC
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The mkII is now finished! It's an On One Fatty 26" X 4" wheel. :D It has a less powerful motor, the battery is in the frame bag. It's loads lighter (but slower) than the Genesis due to the smaller motor and battery, and the frame being alloy, fork carbon. I couldn't decide how to mount the battery on this one. The frame is really small and the other battery only just fitted in the Genesis. I thought about rack mounted batteries and Seatpost mounted ones. In the end I opted to take a standard battery out of it's plastic case and sort the loom. It all fits nicely (with the controller) into the frame bag and at a quick glance doesn't look like motorised steed. I've only tested it up and down the road so far but it all seems to be working well.


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 Post subject: Re: Re:
PostPosted: Thu Apr 13, 2017 8:07 pm 
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Joined: Sat Jan 22, 2011 11:22 pm
Posts: 386
Location: London
tiboltrider wrote:
1. I bought some purple bolts and 2nd hand Deore cable pull calipers. I've got to use cable pull calipers as the supplied brake levers have a cut out to the motor. I've still either got to fit a 160mm disc or change the mount.

4. XT thumbie fitted. I tried a couple of different RF+ shifters but they wouldn't have worked with the twist grip throttle (anyways screw on rear block is 7 speed). Also purple top cap, speedo monitor and suitably named handle bar.


Nice work. A couple of points from when I built my electric Felt hardtail that you may find helpful.

For the brake cut out, I used a very neat inline pressure switch tapped into the hydraulic brake lines and allows you to use proper disc brakes. I have a spare one kicking around here someplace.

For gear changing, I mounted a SRAM twistgrip shifter on the left bar.


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 Post subject: Re: Re:
PostPosted: Thu Apr 13, 2017 11:05 pm 
South West Deputy AEC
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Location: DEVON
GSB wrote:
Nice work. A couple of points from when I built my electric Felt hardtail that you may find helpful.

For the brake cut out, I used a very neat inline pressure switch tapped into the hydraulic brake lines and allows you to use proper disc brakes. I have a spare one kicking around here someplace.

For gear changing, I mounted a SRAM twistgrip shifter on the left bar.


Hi. Thanks for the feedback and cool build thread. Do you still have your bike? Any problems with long term use?

That brake cut out switch sounds cool - I think I may try that if I ever build a faster one. The cable pull brakes actually aren't as bad as I thought they were going to be though. I may just fit a bigger rotor on the front of the orange bike sometime - it was getting a tad warm on the last ride.

The r/h gripshift mounted l/h also sounds good. It sounds like a really good way of getting over the lack of space problem on the right side. I've just removed a rapid rise rear mech though which was annoying enough on one of the other bikes. The r/h thumbie, on the white bike, only just catches the twist grip throttle and works ok.

:D


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 Post subject: Re:
PostPosted: Fri Apr 14, 2017 12:30 pm 
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Yes, I've still got it, although I dont use it that often. The centre drive works well and means there's a huge choice of gearing and speed capability, and it's very efficiient, but it also means it's hard on transmission parts, particularly chains. I snapped one last summer climbing the steps up to a set of lock gates by Abbey Mills. The only other issues are the motor controller overheating at full power (solved by putting it out in the airflow) and the freewheel in the centre of the cranks disintigrating which was solved by using an ACS Crossfire freewheel instead of the cheap Chinese crap the cranks came with.

Currently though, I'm waiting on a new 70volt charger. I periodically put the battery on charge when I'm not using it, but last time the charger got a bit damp, and blew up.


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PostPosted: Fri Apr 14, 2017 12:51 pm 
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Joined: Sat Jan 22, 2011 11:22 pm
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Location: London
Magura Hydraulic switches;

http://www.ebike-solutions.com/en/shop/ ... rakes.html


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 Post subject: Re:
PostPosted: Sat Apr 15, 2017 3:20 pm 
South West Deputy AEC
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Joined: Wed Jan 09, 2008 1:15 am
Posts: 2647
Location: DEVON
Thanks for that linky. I did have a go on a mid-drive pro bike company built bike and it was nice and smooth. But I soon got bored with it when it cut out at the 15 mph limit. It'll be cool to see how technology advances over the next few years and the prices should drop loads! Hopefully one day a Stealth Bomber Bike will be within my reach! :lol:


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 Post subject: Re: Re:
PostPosted: Mon Apr 17, 2017 9:12 am 
Old School Grand Master
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Joined: Mon Jun 14, 2010 9:06 pm
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Location: Herts UK
tiboltrider wrote:
I did have a go on a mid-drive pro bike company built bike and it was nice and smooth. But I soon got bored with it when it cut out at the 15 mph limit. l:


I thought they are restricted to 15 mph otherwise classed as moped so would need road tax and insurance (mot too?).


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 Post subject: Re: Re:
PostPosted: Mon Apr 17, 2017 9:44 am 
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Joined: Sat Jan 22, 2011 11:22 pm
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Location: London
02gf74 wrote:
tiboltrider wrote:
I did have a go on a mid-drive pro bike company built bike and it was nice and smooth. But I soon got bored with it when it cut out at the 15 mph limit. l:


I thought they are restricted to 15 mph otherwise classed as moped so would need road tax and insurance (mot too?).


They certainly are. Restricted to 15MPH and 250Watts, but it's not easy to implement. I achieved this on my home built bike by using speed and current/voltage sensors feeding into a supervising control computer. The computer intercepts the twist throttle demand signal and backs off the throttle so the limits aren't exceeded. You can of course turn these up for more power/less range, or even turn them off entirely for off road use, when the full 1200watts (about 1.6hp) can be used.


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