I have a converted Goldwing bike. I originally bought the 120" case because trikes are much bigger and wider than other touring bikes. The cover is definitely big enough. It covers the entire length to the bottom with lots of extra fabric. I also have a 103" Bought just to see if it could fit a little better. 103 fits - hardly. He stretches the rubber band to its limit. It's really your preference. If you want a very tight fit go for 103. If you need a lot of fabric go for 120. They protect my bike from rain and tree sap. Exactly what I needed.
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