Shimano Nexus questions

[CRASH]

My boss wants me to convert his Dyno Mooneyes to multi-speed for him. I recommended the Nexus system since it won't mess with the frame (will it?) and won't require caliper brakes.

As far as gearing, what's the difference between 3 and 7 speeds? Meaning, is the high and low gears the same, there are just more options in between for the 7 speed? He's having trouble going up hills with the single speed coaster, and that's what's driving this change. Will 3 speed be sufficient, or what does the 7 speed do for him?

Also, other than a hub and shifter, what will I need for the conversion?

He wants some sort of suicide shifter for the cool factor, so I'm going to have to figure out that as well.

 

[user 135]

This is a nice reference for the Shimano Nexus hubs. http://sheldonbrown.com/nexus.html
More complex reference http://hubstripping.wordpress.com/inter ... ub-review/

7speed is %245
3speed is %184

The 3 speed would probably be adequate. Depending on what Cog and chainwheel you use.

 

[Rat Rod]

You also need to consider rear hub size. Most of the time the 3 speeds will fin without any issues, but once you start getting into the 7 speeds it can be a tighter squeeze.

I personally think 3 speeds is perfect for a cruiser. :wink:

 

[CRASH]

Can anyone dumb down what the 186% means? I have no idea.

Also, what is a "Roller Brake"? Same as a Coaster?

 

[user 135]

Can anyone dumb down what the 186% means? I have no idea.

Also, what is a "Roller Brake"? Same as a Coaster?

Sorry, that is the over gain ratio. That is the difference between 1st and 3rd gears.

Roller brake is a hand operated brake. It needs a brake lever on the handle bars.

 

[CRASH]

Thanks. He's going with a 3

 

[Pop.Cycle]

Curious CRASH how this panned out.....

Was the axle width on the Nexus the same or did you have to get the frame to fit?