If it helps any, both my W-400 and 650 use 7.50x18. I am guessing that tire sizes could also be optional across several size.

My W-400 has a tubular front axle. They may have upgraded the tire at the same time.
 
mine has 7.00 18's and was just curious. it needs tires so I was wanting to get the right tires
 
Well, you aren't going to be able to switch to 16's easily or cheaply.

Just get the 7.00-18 tires and be done with it.
 
The regular w6s used 16 in tires. When they switched to the super w6s with the channel frame they added five spoke rims with 18in tires.
 

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