[quote=FUBU]
"BTW, difference between 185 and 181 pulley? what is best?"

The difference is 4mm. As to which one is best? Only you can make that decision. There are several
threads here that you need to search for and read. It may take several hours or even days depending on how much spare time you have. And then after you do all that research, you may decide that you really want a 178, not a 181 or 185. Or, you may find out that after all that research, you still don't know which one you want. But, good luck w/ your decision. Could you let us know which one you pick and why? Skoal