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Specialized Sirrus Upgrade(6 posts)

Specialized Sirrus Upgradeecna
Oct 13, 2003 5:32 PM
I have an '01 Sirrus Comp and wanted to upgrade the crankset and derailleurs to something more "roady". I'm no bike expert and not sure how parts interchange. I guess I'm looking for a bottom bracket, crankset, derailleurs and chain something like a 105 or Tiagra but need it all to work with the Deore shifters. Any ideas?
re: Specialized Sirrus UpgradeCrankist
Oct 14, 2003 9:49 AM
I have the same ill-conceived bike. It was my first.
I took a different approach to making it ridable. I hate flat bars so I installed drop bars with Ultegra shifters. Brake adjustment is real sensitive; I haven't yet worked it out to my satisfaction. I yanked the smallest chainring and adjusted the front deraileur to limit at the middle ring. I replaced the 11-34 cassette with a 12/25. I also replaced the seatpost to a normal type, and the saddle as well.
I had extra parts on hand to do this - the bike is certainly not worth the additional upgrade expense. As it stands now the bike is twitchy steering and barely acceptable overall when factoring in the painfully stiff frame.
I imagine the shifters will work well on 105 ders. - at least having done the opposite in effect - and it's shifting fine.
If I were you I'd just replace the cassette. Also research a source for bolt-in 52 and 42 (or 39) chainrings. Or just leave it and do most of your riding in the lg. chainring.
Post your results.
re: Specialized Sirrus Upgradeecna
Oct 14, 2003 8:11 PM
As far as bars go, I'm more of a mt. bike guy and wanted the flat bars. I guess my biggest question is whether the Deore shifters would work with road derailleurs. I didn't know if that was some kind of mismatch being road and mt.
re: Specialized Sirrus Upgradeoddsos
Oct 15, 2003 1:50 AM
Hi ecna

Your Deore shifters will be compatable with road derailleurs as long as you stick to Shimano components.

Oct 16, 2003 8:51 PM
but the front shifter will not have the 'trim' feature road sti shifters have. shimano makes a rapidfire plus shifter that does, but i forget the model number. ( it's on our '03 burley rock & roll ).
Oct 17, 2003 8:33 PM
What's the "trim" feature. What does it mean to me? Thanks.