hi, I also own a TDM900!
DP tire options is THE issue...
In the 900 the rear rim is a 5.0x17 and front is the 3.5x18.
My plan is to swap the front rim to a 3.5x17 (yamaha yzf r6/r1) and use supermoto rain tires or pirelli MT60R... 120x70 and 160x60...
Other problems for DP convertion is the bashplate and low level side exhausts...
'71 BSA B25SS