I’ve been thinking of reducing the weight of my emtb for a number of reasons, (easier to carry around, easier to take it in the air, and more manageable in case of a fall)
My current setup
Haero bro deck
Apex air trucks with POM moon drive and mbs plastic hubs
Mbs f4+f5 heelstrap
12s5p 12700 molicell on a custom enclosure
Flipsky 6375 motors
Maker x dv6
Bull bar
I am thinking of changing the battery to a 16s2p, maybe make 2 of them to be swapped for longer range rides, change the gear drive for a chain or belt drive+tensioner, put 6355 motors and finally remove the bull bar.
What do you guys think about going from a big ish 12s to a small ish 16s? I am thinking of using 170kv motors geared for as close to 28/30mph as the pulleys availability allows me, that way I can hopefully pump a fair amount of amps through the small motors.
And what do you think about chain drive or belt drive instead of gears?
Definitely don’t do 16s2p. That’s a miniature battery on a emtb. Changing packs mid ride will suck, unless you really care about weight, I’d choose 12s5p over that. 60 cells is the minimum I’d do for any pneumatic build.
It’s not like you’re saving any weight doing two packs, since you have to carry that second pack on your person anyway. So you need to ride with a backpack to carry the extra pack, right?
The point is reducing weight to have a board that I can use for tricks and short fast off-road rides, so going to 16s4p will be even worse. I currently do 23 miles with the 12s4p, I reckon 16s2p should give me around 10/12 miles, I will be carrying the extra battery on my back only when I know I’m going for a longer ride.
Jump drives is not a massive difference in weight, do you reckon a belt or chain drive will be a lot lighter?
How about 16s3p, still going to be capable of pushing 90a
Ph yes i tried them in several occasions and the are fantastic, but still around 500g each, and since I won’t have much power after the updates I reckon belt with a tensioner might actually be enough to handle the reduced torque.
I see countless trampa still going strong with their 20mm belts
Sounds interesting! @Evwan has a 16s3p that he bullies the crap out of, but it seems to be going strong. He does mention it gets a tad bit of sag.
One of the few situations where p45b may actually help you out. I have a small swappable enclosure you may be interested in checking out, but do know thag a 16s2p or 3p in a bag on your back will slap you about quite a bit, so something to think about.
12s3p 30t Dylan warren and Jump drives. Edit, 15kgs. Jumps will be lighter than chains. Belts break. You saw all the guys drop out of races on Tampas at EEBIT?
@Battery_Mooch just posted a cool article on his Patreon about how the significantly reduced sag of p45b at high currents gives us more wattage at the same current draw. Highly recommend giving that a read if you’re interested in the cells. Its a couple of bucks a month for a wealth of knowledge.
So the p45 have more capacity and a higher discharge, sound ideal for my project,
A 16s2p will give me 90 amps and around 500wh, going to 16s3p will not be worth it as it will only save 600 grams, but if the p45 have less sag maybe I’ll still be able to enjoy a decent 10 mile ride.
