It is perfect for a clyde. I'm 6'3" & 225 but the SM will handle the extra pounds just fine. I'm using an XL with the Manitou 4-way coil over (500# spring). If he's strong as well as heavy then you'll need to select beefer parts than I used. I lost the strong a few years back when I stopped riding 3 times a week and became a happy weekend warrior.MendonCycleSmith said: