if you shower before you leave, and wear clean bike clothes, no matter how hard you sweat, i don't think you'd be offending anyone when you got there!

why not just ask someone someday if they can smell ya? i used to wear a t-shirt shorts and sandals (while running a lab full of PC's for the undergrads) and coulda cared less if i smelled but your environment may not be as slack as mine was... but now i work in an office, commute 15 miles each way with no showers here in the cube farm. i just change into my business casual in the bathroom when i get here and no one's complained yet...

i had great times at grad school! and don't forget to use the downtime to ride your bike!