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<blockquote data-quote="rickpaulos" data-source="post: 1211969" data-attributes="member: 434">I totally agree about how cheesey those motor kits can be.&nbsp; There are slightly better kits where the main sprocket threads on to a hub instead of bolting to the spokes.&nbsp; But those kits require spoking up a wheel which is beyond many builders abilities.&nbsp; Another option would be to use a disc brake hub and bolt the drive gear to the disk mounts.&nbsp; The biggest danger I see is the chain tension device.&nbsp; Some are a single jockey wheel on a short metal bracket that only attaches to 1 stay. Those can turn and go into the spokes.&nbsp; A better design is a long bracket that spans both the seat stay and chain stay.&nbsp; Better than that is a motor bracket that allows for moving the motor to adjust the chain slack.Kit motors are available in 49cc (legal everywhere) and 88 cc. And in 2 cycle or 4 cycle.Brakes or lack of.&nbsp; At my local bike coop I get guys looking for rear wheels after they ripped them out.&nbsp; The single common factor is no brakes on their motorized bikes. The brakes are in the way of some kits so they just take the brakes off.&nbsp; I've had a couple customers switch to electric drives of various types.There are some vids on youtube where they use cordless tools to power bikes.</blockquote>

[QUOTE="rickpaulos, post: 1211969, member: 434"] I totally agree about how cheesey those motor kits can be. There are slightly better kits where the main sprocket threads on to a hub instead of bolting to the spokes. But those kits require spoking up a wheel which is beyond many builders abilities. Another option would be to use a disc brake hub and bolt the drive gear to the disk mounts. The biggest danger I see is the chain tension device. Some are a single jockey wheel on a short metal bracket that only attaches to 1 stay. Those can turn and go into the spokes. A better design is a long bracket that spans both the seat stay and chain stay. Better than that is a motor bracket that allows for moving the motor to adjust the chain slack. Kit motors are available in 49cc (legal everywhere) and 88 cc. And in 2 cycle or 4 cycle. Brakes or lack of. At my local bike coop I get guys looking for rear wheels after they ripped them out. The single common factor is no brakes on their motorized bikes. The brakes are in the way of some kits so they just take the brakes off. I've had a couple customers switch to electric drives of various types. There are some vids on youtube where they use cordless tools to power bikes. [/QUOTE]

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