Numbers I've seen published for the R3 say it weighs 750 lbs.
The M109 weighs 650.
I was thinking the R3 is 800 lbs. (it is, wet)
So, in any case, the 109 is at least 100 lbs. lighter.
Suzuki uses a lot of aluminum. The entire swingarm is alloy.
If you check my post you'll see I didn't say it...