Very easy to knock that 28lbs down. Wheels and tires!
I've had a 4.5 and now an sb100. I think they're similar when sitting and spinning, but the sb100 does feel more responsive when sprinting out of the saddle. One or two pedal strokes out of a turn and it's moving fast. Maybe that's what you mean?
I've got an SB100, and chose it over the Blur TR, and feel that it's a rocket. I am used to SS'ing and HT's, and the Yeti feels very similar when I lock it out, and super responsive and efficient even when in Trail or Open modes. I have put alot of miles, and some long, hard rides on it in 1.5 months, and I am extremely happy with it as a 12/24-hour, marathon and stage racing machine.
My SB100 is a Turq XO1 build, that I've currently got at 26.20 lbs, including pedals (heavier M9120's), heavier Ergon GS1 grips, bottle cage, mount for pump and Garmin mount. That is with a carbon wheelset (30mm Chinese carbon rims, Reynolds hubs), with Rekon 2.4 WT tires. For racing, I'll swap out the pedals for M9100's (which I have on my SS) and the tires for Ikon 2.35's, which will put it in the low-25's. I could easily get it into the 24's, by swapping out the brakes and seat, but I'm happy with it as-is.
I should also note a few other changes I made to get the weight down:
- XG-1295 cassette for the stock 1275
- Bike Yoke Devine SL 80mm dropper for the stock Fox Transfer 150mm
- Rekons as noted above for the stock (heavy) tires
The bike feels solid as hell, and is stable and confidence-inspiring in the chunk, yet takes off when you put the spurs to it. Exactly what I was looking for.