Sram/ultegra compatability

[bikemo50]

My bike is a Specialized Roubaix with 105 triple components (2007). Because the frame cracked Specialized is replacing my frame with a SL3 pro. I would like to upgrade some components; Sram apex 11-32 cassette, Ultegra 6700 compact crank 50-34, and Ultegra BR-6700 brakes. Will these parts be compatible and what else would I need to change when I transfer my parts to the new frame. Thanks, Michael

[Painkiller]

Just make sure the brakes have the proper reach specs, you may want to replace the chain, and you may need to change the spindle/bottom bracket

[bobtravers]

105 rear derailleur should not take a 11-32 cassette, because the largest sprocket you can put on is a 27 or 28

Is your bike have some external BB bearings like theses??

http://www.bikepedia.com/Images/image2.aspx?w=300&h=300&filename=BBST2320.jpg&f=Hawley

I can help you further if you can check on your rear and front derailleur for the model ##, it should be RD-XXX and FD-XXX

[bikemo50]

(11-14-2011, 09:51 PM)bobtravers Wrote:  105 rear derailleur should not take a 11-32 cassette, because the largest sprocket you can put on is a 27 or 28

Is your bike have some external BB bearings like theses??

http://www.bikepedia.com/Images/image2.aspx?w=300&h=300&filename=BBST2320.jpg&f=Hawley

I can help you further if you can check on your rear and front derailleur for the model ##, it should be RD-XXX and FD-XXX

I have purchased a sram 11-36 cassette and a SLX-RD-M663 as well as a Wippermann 10SO chain. I hope the 105 shifters will handle that derailleur. I still would like to get a Ultegra 6700 50-34 crankset. I believe the new frame takes a BB60 bottom bracket and a braze-on front derailleur (my 105 is a clamp on) so I'll need to replace them as well. Do you see any issues with this set-up? Thanks, Michael

[bobtravers]

Well mix-match of parts usually don't work very good, but, total capacity of the rear derailleur is fine... The only thing I don't know is do road shifters work with a MTB rear derailleur??? Is the ratio of cable plulled is the same on a road and MTB shifters?

[Joe_W]

Yes, most of the Shimano road and MTB RDs need the same amount of cable pull. On the conversion: I yould have gone with 3 chain rings in the front and a road cassette. The jumps on MTB cassettes are much too wide for my taste...