Sprocket size????

We have ordered a 80 2 stroke kit for my wife, but have yet to get a bike. She wants something that is easy to get on [low]. The kit says it is for a 26" weel, so if we went with a 24" weel would we need another sproket?

Using a 24" wheel will make the bike slower, unless you go to a smaller sprocket.....................................

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If you went with a 40 tooth sprocket instead of a "standard" 44, it would compensate. A 24" is about 92% percent of a 26", and a 40 is about 92% of the 44. 40s are pretty widely available.

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LOOK at the mounting space needed by the engine..
Quote We have ordered a 80 2 stroke kit for my wife, but have yet to get a bike. She wants something that is easy to get on [low]. The kit says it is for a 26" unquote .


Yes, a Happy time framemount chinese 2 stroke engine will fit a 18 (shoehorn needed) to 26 (very easy) MEN'S with a diamond shaped opening in the middle bicycle.

A rack mount friction drive is the only kit that I know of that the rear wheel size does not matter.
The rear wheel is only a spacer between the drive spindle and the ground. LOL

A small ish 32 cc subaru rack mount friction drive will last forever and fit everything.

The rear wheel size does matter...a little, a 24" wheel will have a slightly lower overall speed at any given rpm than a 26".

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Except for a friction drive, which drives the outside diameter of the wheel at a certain speed (not rpm as a sprocket drive does) which would be friction wheel RPM multiplied by it's circumference. So the tire tread tavels a certain feet per second,not revolutions per second. And since the tread is connected to the ground, it then travels at the same feet per second.
So rear tire diameter is irrelevant on friction drive.

Like Big Joe said: It won't make that much of a diffrence but the up side is she'll have better low end torque.

But the only thing to increase/decrease bike speed on friction drive is to change the drive wheel size, not the driven wheel size.

My mistake. I didn't read the whole thread. I thought the discussion was about sprockets. You are correct that on friction drives, the diameter of the spindle determines the speed.