Solar Cross electric bike 18 speeds Demonstration - Motor 6T:80T ebike Drive

[votar109]

Dose this bike get up hills with no problem?

Can somebody tell me please.Thank u

[electrodacus]

The problem I see is the gear ratio between motor and first sprocket is more than 3:1 and you do not have any chain tensioner.

[nja2015]

@electrodacus Motor 6T to 80T drive / I most definitely should go with a 5T, as the motor turns the pedals a very close turn to many except when maxing pedaling cadence in going for top speed.. hope this helps

[luc59457]

@nja2015 Motor is quite low in teeth, good for the ratio, may slip easier when the teeth gets used or under heavier loads. They sell a 90T for the no.25 but you will have to get the holes machined precisely and then the end piece Cut off and smoothened out. This will allow bigger motor sprocket. Should add a tensioner,the one I used for the Currie was from Dalton Gear. Make sure you have a good Derailleur back there,thick steel,no weak and loose crap.You should check it, something looks sketchy.

[nja2015]

@luc59457 yeah.. this extra play/noise is actually when the chain is on small sprocket upfront and the lowest teeth count on the rear gears, the large sprocket upfront gets in the way.. Made this video because I just got a new 9 speed chain.. The bike can ride like a dream... but yeah in the most demanding loads I need to use a strict set of gears.. I had seen them upto I think 125T also.

[luc59457]

@nja2015 Wow, I never seen them that large, having the no.25 on the inside would not provide enough clearance for various frames.I have a 90T here and the clearance is quite close. But if you reverse them, the big sprocket upfront won't get in the way, except maybe on first, depending on how much clearance you have between the two. I have minimum 5mm in between.

[nja2015]

@luc59457 yeah 5mm sounds about same.. I did it this way 22T / 34T / 80T (#25) on the outside

[luc59457]

@nja2015 How is the performance on road, have you tried?

[nja2015]

@luc59457 hmm yep -very nice machine .. ups the endurance level .. huge sprockets over 100T (#25) would be just like a light cycle.. just got to work on the wind dynamics ... haha

[electrodacus]

@nja2015 Thanks, I was referring that a larger than 3:1 ratio will require a tensioner similar to what you have on the back wheel and you now have a 80T / 6T = about 13:1 ratio that is huge so you will damage the sprocket and chain and it also can get out.

Probably a 3:1 will not work with your motor so you will need an additional gear or a tensioner.

Also the hub brushless motors are not that expensive now I see no reason why you will want this setup.

[nja2015]

@electrodacus I have been riding with this configuration and Im pretty good at using the whole 18 gear range.. without any issues at the pump track and flats @ full speed... albeit so far on only 24V. Iam 100% confident in the parts.. and dont need to replace anything unless Im all in it and replace everything...

[electrodacus]

@nja2015 It makes sense since you already build that you do not want modified it was just an observation.

[nja2015]

@electrodacus no prob....learning covering alot of the bike in thin films/tapes.. . back to work I go