This is my solar DH bike and first ebike build. I made a lot of mistakes along the way, but it didn't cost much and I learned a ton. The frame is a 2012 Bicycle Fabrications MissingLink(TM), co-designed by Hank Matheson and I. Hank did most of the fabrication. You can see more on the MissingLink in this Dirt Rag article - http://dirtragmag.com/jon-heim-details-another-new-2d-suspension-platform/
I started the ebike conversion in June of 2015 and had it running in about 3 weeks, but it took a year to get fully sorted. I burned one motor twice and one controller. This bike is not high power or long range but is enough to help get me up the hill nearby.
Parts, mods, and rough costs:
2x Unite MY1016 24V 350W brush gearmotor $104
timing advanced ~12 degrees $0
2x Yiyun 36V 500W controller $23
12s HK Lipo, 3 x 14.8V, 222Wh $100
precharge circuit, fuse, switch $5
larger brushes and modified holders $6
high temp brush board $5
high temp ceramic/ss bb, epoxy potted in brush cover $8
cooling holes in motor and controller $0
2x 24V 40mm fans in series, 1 for motor, 1 for controller $4
filters and screens from automotive air filter $0
shunt mounted inside controller box $10
volt and ammeter to motor $10
pack voltmeter $8
stator temp gauge $5
Dicta crank freewheel $12
12t generic Ebay motor freewheel $5
diy freewheel adapters $15
8s motor chain $0
SBP 170mm cranks $25
square taper bb $10
40t chainring $20
custom upper chainguide $0
custom 9 speed 11-44 cassette, 44t chainring pinned to 34t $0
modified derailleur $0
total ~ $375
Advancing the timing was the key to the motor surviving higher power. I figured that out last of course. I wouldn't recommend this build unless someone was a glutton for punishment and or on a budget. It has been a fun and cheap education though.
I started the ebike conversion in June of 2015 and had it running in about 3 weeks, but it took a year to get fully sorted. I burned one motor twice and one controller. This bike is not high power or long range but is enough to help get me up the hill nearby.
Parts, mods, and rough costs:
2x Unite MY1016 24V 350W brush gearmotor $104
timing advanced ~12 degrees $0
2x Yiyun 36V 500W controller $23
12s HK Lipo, 3 x 14.8V, 222Wh $100
precharge circuit, fuse, switch $5
larger brushes and modified holders $6
high temp brush board $5
high temp ceramic/ss bb, epoxy potted in brush cover $8
cooling holes in motor and controller $0
2x 24V 40mm fans in series, 1 for motor, 1 for controller $4
filters and screens from automotive air filter $0
shunt mounted inside controller box $10
volt and ammeter to motor $10
pack voltmeter $8
stator temp gauge $5
Dicta crank freewheel $12
12t generic Ebay motor freewheel $5
diy freewheel adapters $15
8s motor chain $0
SBP 170mm cranks $25
square taper bb $10
40t chainring $20
custom upper chainguide $0
custom 9 speed 11-44 cassette, 44t chainring pinned to 34t $0
modified derailleur $0
total ~ $375
Advancing the timing was the key to the motor surviving higher power. I figured that out last of course. I wouldn't recommend this build unless someone was a glutton for punishment and or on a budget. It has been a fun and cheap education though.