Yes. Im commuting on a Marin Coast Trail MTB.

Replaced the stock plastic pedals with platforms and a pair of 5.10's. Replaced the stock saddle with a Bella Italia Ldy. Replaced the knobbies with Michelin "City" tires. They made the ride a little stiffer, but much faster.

Added bar ends, white blinkie front light, red blinkie rear light, wireless computer, Topeak DX Pro Tourist rack, Ortleib panniers, bar end mirror, front fender, clip on water bottle holder, TiGr lock. I have some bright lights for winter...they may need to be replaced this year.