Main Motorcycle: 05 T100
Join Date: Apr 2005
Location: Hertfordshire, UK
Other Motorcycle: Don't need another one!
I haven't ridden one of the bikes with a 17" front wheel, but I have fitted an 18" front wheel from a Thruxton (along with forks, mudguard and speedo drive) to my T100. It has noticeably quickened the steering, but to be honest, ditching the Metzeler tyres for Avon Roadriders made more difference. I would also add that my bike still has "slower" steering geometry than a Thruxton, as that bike also has longer rear shocks and slightly less rake due to the different geometry of the fork yokes (triple trees). I believe the cast wheeled bikes have similar geometry to the Thruxton (but shorter rear shocks) as well as the smaller 17" front wheel with less inertia. I would certainly expect this to be noticeable when compared to a stock T100 with 19" front wheel.
I would suggest giving them both a try (again?) and see what you think, although the current weather here isn't going to make that easy any time soon! If you prefer the look of the T100, but like the quicker steering of the cast wheeled bikes, you can always fit Thruxton wheels and longer rear shocks at some point in the future to get close to your ideal.
Aubergine & White 05 T100 (865cc) with numerous mods.
(Previously Ducati Monster S4 and several UJMs)