I know there must be some roadies out there that could help me out, or point me in the direction of a good site that could help. I am a mountain biker but my gf has gotten me into road biking. I have been riding my mtb with little skinny (1.5") smooth tires but i am currently building a road bike from various used parts i find at my local bike shop or on e-bay. i only have a few parts left to get, shift/brake levers, derailers, brakes and a chain. so my question is, I just got a wheelset (used - mavic helium) that has and 8-speed cassette. so, if i get a 9-speed STI lever will it work with the 8-speed? cant i just adjust it tight enough so it wouldnt shift into the 9th gear and would seem to be 8 speed? or should i just get some different spacers and add a 9th gear? just curious, thanks for your help!