Both bikes have a 750w big magnet Bafang. The fatty's 750 is inside the stock 350 motor housing. Fatty has a 48v 30ah battery driving a 35 amp big momma 18 fet controller.
The Fold started life as a Foldx7. I replaced the stock 20 x 80mm rims with more sporting 24" x 65mm rims laced to a 750 Lindsey motor, which slightly increases overall gearing over a stock Fold. That still leaves the overall gearing a lot less than the fatty so it's able to make due nicely with just a 25 amp controller,
Both bike's lighting is powered off of the main battery.
Tires, Tubes, etc...
http://www.bikeman.com/TR0360.html?utm_source=GoogleBase&utm_medium=GoogleBase&utm_campaign=GoogleBase&gclid=Cj0KCQiA8f_eBRDcARIsAEKwRGfKdElSYFEPPK7yZr15-lT0aEbSKQZhCgeZbrWwA5VHdowzBKr33GwaAllPEALw_wcB http://store.sondorsforum.com/collections/accessories https://www.fattirebikeparts.com/index.php/extreme-fat-tire-bike-parts-and-components-online-store/fat-tires-fat-tire-tubes-for-fat-tire-bikes/xtreme-patented-skull-pattern-fat-tires-detail http://www.ebay.com/itm/2PAK-Sunlite-Vee-Crusher-26-x-3-5-Wire-Bead-Fat-Bike-Tires-Black-fit-Speedster/371308581884 https://www.walmart.com/ip/2-Vee-Rubber-26x4-7-Mission-Command-Pair-Fat-Tires-Folding-Bead-Silica-Compound/320476468?wmlspartner=wlpa&selectedSellerId=10232&adid=22222222227144302754&wl0=&wl1=g&wl2=t&wl3=253414499279&wl4=pla-416990220389&wl5=200623&wl6=&wl7=&wl8=&wl9=pla&wl10=117446822&wl11=online&wl12=320476468&wl13=&veh=sem http://www.treefortbikes.com/product/333222416140/1528/Vee-Tire-Co-Mission-Command.html?utm_source=google&utm_medium=cpc&adpos=1o1&scid=scplp333222416140&sc_intid=333222416140&gclid=CjwKCAjwnLjVBRAdEiwAKSGPI3b8STHe_0gtM0A8M1T7OP6416l5nf3LxDu_3ys3U1S7Qu1H4b4A-BoC-BkQAvD_BwE Mr. Tuffy tire protectors
http://www.ebay.com/itm/MR-TUFFY-XL-SERIES-Fat-Bike-3XL-26-29x3-1-4-0-Tire-Guard-Liner-Tan-Pair-/301842802164 Studded Tires
http://www.aliexpress.com/item/26x4-9-Studded-Tyres-for-Chaoyang-for-sondors-ebike-fat-bike-tire/32597372847.html Fat Tire Rim Strips
http://www.amazon.com/Fat-Bike-Rim-Strips-yellow/dp/B01AJFEB32/ http://store.sondorsforum.com/accessories/products/fat-bike-low-profile-street-tire?variant=5690083587 MAXXUS Mammoth Fat Tire
http://www.ebay.com/itm/272084778558 VEE Rubber Tube 26"x4.00 (will also fit to 4.9)
By Chad Lauterbach
After upgrading the front crankset, rear freewheel, (53/17 final gear ratio), chain, LT48 battery, 20-amp controller and display the bike was a beast. Easily commuting to work at 26-27mph and hitting 28-29+ with a bit more effort. The issue was at those speeds in LA traffic I needed the ability to stop fast too. And re-adjusting my brakes every ~2-3 weeks was also getting annoying. The solution was new tires, hydraulic brakes, and Rotors. Here's what I got:
Rotors: Shimano Deore RT66 180mm 6-Bolt Disc Rotor
Brakes: PASION E BIKE MTB Hydraulic Disc Cut Off Power Brake E-Bike (This is basically just a Shimano Hydraulic brake set that's been modified to have the motor cut-off. Make sure to select the right option, in my case it was the second one from the left as my controller has the 2-pin (red) motor cut-off).
Rotor Spacer: Shimano F180P/P2 Disc brake adapter
Hose Wire Clip Clamps: Jiyaru Bicycle Cable Guide Brake Line Holder Hose Wire Clips Clamps (To route the hydraulic hose by attaching these to the existing closed cable lines).
Tires: Schwalbe Marathon Plus HS 348 Road Bike Tire
This thing stops like a beast now and with the extra traction from these tires this is a nice safety upgrade. Should reduce the changes of flats too as these tires have built-in tire-liners essentially. So far really happy with the upgrade. :)
I hope this helps somebody out!