Wheel Swapping?

[ejether]

Generally, I don't worry about the wheels so long as they are round but I'm thinking of building up a mid 80's UJM , not sure which one, but I know it won't have spoked rims on it.

I'm pretty ignorant about swapping wheels around, can anyone help lead me down a path of understanding?
How can I find out what wheels will fit? What about building spoked rims up?

Really any ideas that can help would be great!

Thanks

 

[Bozz]

It's not necessarily rocket science, but you do need to pay attention to the details.

If the only thing you are changing are the wheels, make a note of the stock axle sizes. If you can find wheels that use the same axle sizes that can save you a little bit of work.
(although you can change bearings to compensate if you need to)

If you are keeping the cable speedo, you need to suss out a speedo drive for the front.

At the rear, you need to be aware of the drive sprocket offset. (how far the drive sprocket in the motor is from the center line of the bike)

Ideally the chain should be straight back. (again, offset sprockets can help you adjust if you have room to use them)

Wheel spacers may need to be made, so at least make friends with a machinist if you don't have a lathe.

Be aware of the stock rim sizes/widths and try not to deviate all that much unless you plan to completely re-engineer the suspension/frame.


Basically, it all depends on how involved you want to get. just about anything is possible with sufficient time and money, but if you are trying to go about it on the cheap, watch the details.

The specific measurements of the bike in question will open up a far more detailed discussion.

 

[ejether]

It's not necessarily rocket science, but you do need to pay attention to the details.

If the only thing you are changing are the wheels, make a note of the stock axle sizes. If you can find wheels that use the same axle sizes that can save you a little bit of work.
(although you can change bearings to compensate if you need to)

If you are keeping the cable speedo, you need to suss out a speedo drive for the front.

At the rear, you need to be aware of the drive sprocket offset. (how far the drive sprocket in the motor is from the center line of the bike)

Ideally the chain should be straight back. (again, offset sprockets can help you adjust if you have room to use them)

Wheel spacers may need to be made, so at least make friends with a machinist if you don't have a lathe.

Be aware of the stock rim sizes/widths and try not to deviate all that much unless you plan to completely re-engineer the suspension/frame.


Basically, it all depends on how involved you want to get. just about anything is possible with sufficient time and money, but if you are trying to go about it on the cheap, watch the details.

The specific measurements of the bike in question will open up a far more detailed discussion.

Thanks for the basics!
When I get a clearer idea of what I'm working with I'll be back