Go ahead and build a bike!
There aren't many here on these forums, but they're here. A 1/12 model will be twice the size of a 1/24, but the smaller ones are far and few between. I've built quite a few of the 1/12 Tamiya kits over the years and can highly recommend them!
Here is a Tamiya 'Mike Hailwood Replica' Ducati in 1/12, and the rim diameter is about 1-5/8 inches.
![](http://i15.photobucket.com/albums/a377/MojoDoctor/Scale%20Models/Ducati3.jpg)
This is the Tamiya Ducati NCR Racer.
![](http://i15.photobucket.com/albums/a377/MojoDoctor/Scale%20Models/Ducati2.jpg)
![](http://i15.photobucket.com/albums/a377/MojoDoctor/Scale%20Models/Ducati1.jpg)