Posted: 02/04/2014 at 16:31
I've ridden both. Road bike in 2011 for both Long Cpurse and IMW, Tri bike in 2013, again for both.
Both bikes have the same set up, 50/34 and 11/28.
Tri bike has 50mm front wheel, and 80mm rear wheel.
Is a Tri bike suitable, you bet. Descended exceptionally well, fast over the first loop out to Angle and back, fine on the flatter elements, OK'ish on the climbs.
Is a Tri bike quicker. Can't answer that. 2013 was a disaster, kicked in the swim, threw up from then onwards, and fought to not quit, so bike didn't go too well, so 30 minutes slower than previously.
2014 though I'll be using a Tri bike.