LOL BIKE

[Grug Arius]

Mongoose "Temissor"

Mods so far:

68-73mm BBSHD motor DPC18 controller

48v 14.5Ah panasonic batteria pack with top rail mounting clamps milled in the shop here

Hobson Easyseat II

Observations about the "Temissor" out of the box:

Rear wheel imbalance, both wheels need spokes adjusted, unacceptable slop in the rear suspension pivot. Front stationary disc brake pad rubs the rotor.

Also, the rear derailleur was getting pulled FORWARD under heavy load. Derailleur gets pulled forward rhythmically under light load while running on the service hoist at a frequency similar to the rear wheel imbalance.

 

[Grug Arius]

The resident 13 year old boy trapped in a 50 year old man's body weighs in:

• Cole:
  you're basically pedalling a moped
  Cole:
  it's not like with all that e-junk added to the bike you can still pedal it and ride it like a normal bike
  
• Cole:
  relatively silent is one, but can't think of any others
• Cole:
  srs question: if e-bikes can weigh up to 100 lbs, what's advantage over mopeCole:
  Cole:
• used Honda Spree for under 1K, runs forever, can do 40 mph, runs all week on a single tank of gas
  

 

[Grug Arius]

This poast is addressed to the 13 year old boy from 1985 who poasts here:

If I ditch the rear cassette/ derailleur system which I hate, and replace it with an internally geared hub, the bike will be almost totally quiet.

Advantages to ebikes over motorcycles and mopeds are obvious:

QUIET (this is an advantage that cant be overemphasized)

Dont need insurance, tags, loicense, etc

Ride on sidewalks, trails, etc without attracting attention

Regarding pedaling, I'd bet that I cover 10-20 times the distance with zero motor assist (ie 100% human power) than you manage to squeeze out on that Redline of yours. Thats on the old bike, that was very heavy, and only had three gears.

The idea that a BMX bike without a kickstand is more useful than even the jankiest e-bike is completely ludicrous but if a guy wants to relive 1985 all over again by riding an eighth mile at a time before becoming completely knackered, then have a great time doing that.

PS POAST VIDYA

 

[Gawn Chippin]

...Derailleur gets pulled forward rhythmically under light load while running on the service hoist at a frequency similar to the rear wheel imbalance...

The centrally-located powertrain puts an immense load on the gears and chain. I would recommend powering the front wheel, instead:

.I would also advise using a hermetically-sealed, virtually maintenance-free internal gearbox such as this Nexus 8. My rear Durailleur also slips the chain over the single gear. But, it's only a matter of tightening its tension:

I've removed the sensor at the pedal assembly. My plan is to control all unpedalled thrust, using a hand-driven throttle, and to move the battery pack onto the vehicle's frame's bulkhead, in order to improve weight distribution

 

[Nikephoros II Phokas]

 

[Grug Arius]

The centrally-located powertrain puts an immense load on the gears and chain. I would recommend powering the front wheel, instead:

.I would also advise using a hermetically-sealed, virtually maintenance-free internal gearbox such as this Nexus 8. My rear Durailleur also slips the chain over the single gear. But, it's only a matter of tightening its tension:

I've removed the sensor at the pedal assembly. My plan is to control all unpedalled thrust, using a hand-driven throttle, and to move the battery pack onto the vehicle's frame's bulkhead, in order to improve weight distribution

The problem with a hub motor is you no longer have various gears coupled to your motor. This isnt acceptable to me.

My previous ebike build was a heavy steel mongoose which I had the BBSHD mounted to. I could never get the problems with the cassette worked out, so I replaced the cassette/derailleur system with a nexus 3 speed hub and tensioner. Once this was done, there was not a single chain/sprocket problem in about 600 miles of operation, till I tore it down for the present build.

As fabricobbling engineer I really detest the noisy sloppy unreliable cassette and derailleur method of changing gears. With over 1000 watts of power its really best to get rid of that system, to setup a true and perpendicular chain angle with unvarying chain tension. IMO a cassette system is just for human power and not a motor nor engine

You are Johnny on the spot with recommending the Nexus 8 speed hub. I will probably do this, since I had such good service out of the cheapie Nexus 3 speed. I cant put the 3 speed hub on the current build unless I wanna get rid of the rear disc brake.

 

[Gawn Chippin]

The problem with a hub motor is you no longer have various gears coupled to your motor...

You still could supplement your existing drivetrain with a front-mounted hubmotor of which would serve as a form of booster rocket or afterburner, if you will.
The Nexus 3 really isn't a "cheapie". They're an update from the previous Shimano 515 of which I used to convert them over to free-driving hubs, because brake shoes were no longer available for them. Here in Germany, the 3-speed Fichtel & Sachs TorPedo/SRAM hubs were much more common, until recent.
Combining the 515 with a chain tensioner and where to modify:

 

[Macrobius]

How to cure the cycling urge:



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www.michigan.org

 

[Grug Arius]

You still could supplement your existing drivetrain with a front-mounted hubmotor of which would serve as a form of booster rocket or afterburner, if you will.
The Nexus 3 really isn't a "cheapie". They're an update from the previous Shimano 515 of which I used to convert them over to free-driving hubs, because brake shoes were no longer available for them. Here in Germany, the 3-speed Fichtel & Sachs TorPedo/SRAM hubs were much more common, until recent.
Combining the 515 with a chain tensioner and where to modify:

The front hub afterburner seems like it would just divide the voltage available if run simultaneously with the mid-drive on the same batteria.

The BBSHD has plenty of power and with a hot battery is really more than I need. I have a programming cable to tweak it's settings to unlock more power but havent needed it.

I am looking for an internally geared 7 or 8 speed hub but it seems like they only show up in 32 or 36 hole versions. Looks like Im either gonna use one of my old 36 spoke wheels or figure out a way to lace up a 32 or 36 hole hub to a 48 hole wheel. Thots?

 

[Macrobius]

I passed this on to my family 'Slack'... biking is srs bidness in this family, and the kids are carrying on that trad. Both unpowered and 'hybrid'.

I remember, fondly, travelling by ferry across Lake Michigan (along with the Chessie System trains...) and landing at Ludington, Mich, an overnight boat trip.

My dad and I would bike up the West Coast camping at various Dunes etc. - we went up to Door County to on the other side. We would crash at Luddington's state park after then exhausing inland sea voyage. I wonder if Lake Baikal is like that?

When he was too old to pedal, my dad did motorcycles instead. He once went missing for three days because he got hit on the Kennedy in Chitown, and landed in some Nig hospital near there -- bit of rib damage but otherwise not the worse for wear. He was saved by his helmet and leather jacket, which are a MUST for cycling if motors are involved. Never wore either myself when flying down a lake-adjacent hill at 30 mph with him though. We lived dangerously in the 60s and 70s....

I got clipped too at a much younger age on one of our trips, by some dude travelling 50 mph (Algoma, Wisconsin, I'm lookin' at you) ... his rear bumper caught my left pannier ... I controlled my bike and got out of the whole thing with nothing moar than a sprained ankle when I landed hard but upright on the shoulder after braking. Cost me the rest of a trip, a cold pack for my ankle, and a bent frame and a torn sleeping bag. Idiot had a problem with 'depth perception' and hit another cyclist a week later. Hope the other guy had as good a time as did, but I've never pursued the matter.

Lesson learned: what doesn't kill me makes me stronker. Life deals you a few knocks now and then. Choose wisely.

 

[Gawn Chippin]

The front hub afterburner seems like it would just divide the voltage available if run simultaneously with the mid-drive on the same batteria...

It would draw more amperage from it, unless you add a supplemental batteria to a front motor using a different voltage requirement. If both motors draw equivalent voltage values, adding a recuperation feature would charge the battery during downhill-coasting and braking

...it seems like they only show up in 32 or 36 hole versions. Looks like Im either gonna use one of my old 36 spoke wheels or figure out a way to lace up a 32 or 36 hole hub to a 48 hole wheel...

You could mark new holes to be drilled onto your present rim, spacing them evenly for accepting your 48 spoaks. A few of the presently existing holes will line up close enuff, so that drilling new ones would only put undue pressure on the nearly siamesed ones next to them.
If you are not willing to use the highly-advanced mathematical formula intended for determining spoak length, you could makeshift the following proacedure and then measure each spoak individually for replacement with conventionals:

 

[Cole of Them Northwoods]

Please sir mr. Phoron, for much giggle, provide running total time+ cost of magic bicycle investment you may someday ride.. ok

Also remember always the safety!

 

[Gawn Chippin]

How to roll threads onto blanc spoax:

 

[Gawn Chippin]

If only 1st World regenerative braking kits were to be available. Perhaps, Japanese versions could be had?

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[Gawn Chippin]

Has anyone ever seen a 3-speed pedal transmission?:

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[Grug Arius]

current build


got rid of derailleur/cassette, installed nexus 3 hub and wheel from previous bike, no more rotor on the rear tho

Also fender and rear rack (will probably relocate the batteria to the rear rack)

Have alfine 8 speed hub on the way, gonna see about lacing 36 hole hub to 48 hole wheel (not pictured)

 

[Todd in FL]

Ima do this to a tricycle I have but put the battery outside of the basket so I still have cargo room. Tricycle is excellent for SHTF since you can carry stuff you scavenge quietly and quick.

 

[Grug Arius]

Ima do this to a tricycle I have but put the battery outside of the basket so I still have cargo room. Tricycle is excellent for SHTF since you can carry stuff you scavenge quietly and quick.

I wouldnt futz with a trike if it were me, remember these things have a nasty tendency to dump their riders forward. They would be ok for some disabled person who has balance problems tho.

You'd be better off with a bicycle trailer if you wanna haul loads IMO.

Recumbent e-bike is a possible alternative

 

[Todd in FL]

I said I wanted it for hauling crap during SHTF. Recumbent is for E-fags.

 

[Macrobius]

A recumbent bicycle is just a rowboat for land.

*PULL* lads.