3D-printed Electric OFO Bike Mod

thingiverse

Hi, rental bikes such as OFO are a great transport in the city but they often do not support different gear speeds. Here is a DIY 3d-printed mod to convert any OFO bicycle to electric. It only takes 2 to 3mins to mount the DIY controller and the DIY friction-drive unit to the bicycle and you have an electric-assist system to help you go up-slope. Below are the parts used for this project. Simply follow the youtube video for the build steps. https://www.youtube.com/watch?v=JiyEnpMJHTM Friction Drive Unit: 4 x Ikea standard L-brackets for anti-topple (local HW shop) M10 60mm bolt with nut x 1 (local HW shop) M4 30mm screws x 2 (local HW shop) M4 25mm screws x 2 (local HW shop) M4 15mm screws x 6 (local HW shop) M4 10mm screws x 2 (local HW shop) M4 washers x 14 (local HW shop) M4 nuts x 18 (local HW shop) M8 nuts x 6 (local HW shop) M8 washers x 2 (local HW shop) 75mm-wide hinge with 6 self-tapping screws x 1 (Local HW shop) Steel Extension spring 39.7mm(L) by 11mm(OD) by 1.6mm (111N per mm) x 1 https://sg.rs-online.com/web/p/extension-springs/0751944 M8 90mm threaded rod x 1 (Aliexpress) 608z bearing x 1 optional (Aliexpress) Turnigy Skateboard Conversion Kit Spare Parts - Motor Mount x 1 https://hobbyking.com/en_us/motor-mount-5.html Flat Head Stainless Steel Knurled Nuts M8 x 2 (to fit threaded rod in Turnigy Motor Mount) https://www.aliexpress.com/item/M4-M6-M8-M10-Flat-Head-Stainless-Steel-Knurled-Nuts-Twist-Screw-Mirror-Hand-Tighten-Adjusting/32841073435.html 8044 Timing Belt Pulley Wheel x 1, DIY Single Motor Mount Bracket for 5065 x 1 and 16T Motor Pulley x 1 Link to set combo: https://www.aliexpress.com/item/8044-Timing-Belt-Drive-Pully-wheel-for-DIY-electric-skateboard-longboard/32808018329.html Head Stainless Steel Knurled Nuts M8 x 1 (to fit threaded rod in DIY Single Motor Mount for 5065) https://www.aliexpress.com/item/M4-M5-M6-M8-Stainless-steel-nut-hand-twist-knurled-high-head-blind-hole-nuts-High/32836999493.html HTD3M belt 252mm by 1.5mm x 1 (Aliexpress) Motor: KEDA 63-64 190KV Brushless Outrunner 10S 2000W x 1 https://hobbyking.com/en_us/kd-53-30-high-voltage-brushless-outrunner-190kv.html 3D-printed mount for Friction Drive unit (all of the above): included in zip file ESC: Hobbyking Opto 90A 7S https://hobbyking.com/en_us/hobbykingtm-ss-series-90-100a-esc-opto-only.html 3D-printed ESC tray for mounting the ESC to Friction Drive unit: Included in zip file Lipo: 6S 5500mah (Hobbyking) x 2 (use in parallel) Wires and Plugs: 2m 12AWG red and black wires x 1 (Hobbyking) XT60 plug male or HXT4mm connector x 1, depending on your lipo pack(Hobbyking) 2m 26AWG servo wires x 1 (Hobbyking) Servo plug male x 1 (Hobbyking) Spring-loaded-Lever Throttle Controller: Cheap servo tester with knob and 3-position switch x 1 (Aliexpress) Standard-size 20kohm potentiometer x 1 (Aliexpress) 3mm by 20mm extension spring x 2 (Aliexpress) 180 2GT timer belt (Aliexpress) M3 30mm screws x 2 (Aliexpress) M3 10mm screws x 2 (Aliexpress) M3 threaded spacer 10mm for micro quadcopter x 2 (Aliexpress) M3 4mm-OD bearings x 4 (Aliexpress) M2 8mm self-tapping screw x 4 (Aliexpress) 3D-printed Throttle Controller parts: https://www.thingiverse.com/thing:2905472 Throttle Controller Mounting brackets: M4 40mm bolt and nut x 3 (Aliexpress) M4 washers x 6 (Aliexpress) 3D-printed Mounting brackets (AKA 'Go-Pro Mount'): https://www.thingiverse.com/thing:86238 Rocker switch x 1 for emergency-stop (Aliexpress) Tools and misc (from local HW shop): Black tape, heat shrinks(25mm-wide & 60mm-wide) Red Loctite, Zip ties, hotglue gun, superglue 60w soldering iron, solder and flux, hand-crank drill and drill bits (3mm, 4mm and 5mm), hammer, hand-held electric rotary tool with grinding disc, some cling-wrap plastic to protect motor magnets from metal dust