fanievb Posted January 6, 2014 Share I have a Shimano pressfit BB (SM-BB71-41) in/on my Giant XTC, the BB is a bit moeg but i cant find the exact BB and I suspect it may be an OEM specific part (running an SLX hollowtech II crank) My question is if the SM-BB91-41A will fit? A pressfit is a pressfit after all? Link to comment Share on other sites More sharing options...
NotSoBigBen Posted January 6, 2014 Share I have a Shimano pressfit BB (SM-BB71-41) in/on my Giant XTC, the BB is a bit moeg but i cant find the exact BB and I suspect it may be an OEM specific part (running an SLX hollowtech II crank) My question is if the SM-BB91-41A will fit? A pressfit is a pressfit after all? Sorry that I can't answer your question but what I do know is that there is/are more than one 'types' of PressFit ...... Link to comment Share on other sites More sharing options...
missionS Posted January 6, 2014 Share Sorry that I can't answer your question but what I do know is that there is/are more than one 'types' of PressFit ...... Big Ben you are indeed correct. Fanie the BB you are looking for has an outer diameter of 86.5mm so using SM-BB91-41A (which has an outer diameter of 92mm) will not work. Link below of where you can get a replacement http://www.chainreactioncycles.com/shimano-bb71-road-press-fit-bottom-bracket/rp-prod61803 Link to comment Share on other sites More sharing options...
missionS Posted January 6, 2014 Share In addition the BB standard you have on your bike is called BB71 and by quoting this to your LBS they should be able to assist should you not want to venture abroad Edited January 6, 2014 by missionS Link to comment Share on other sites More sharing options...
awesme Posted January 6, 2014 Share Hi there Have a read: http://mgltipriders.asn.au/node/18518 BB91 is just a higher spec than BB71, no physical/dimension differences. G Attached is the Techdoc.shimano for the BB91.EV-SM-BB91-2987A_v1_m56577569830726016.pdf Edited January 6, 2014 by awesme fanievb 1 Link to comment Share on other sites More sharing options...
fanievb Posted January 6, 2014 Share Big Ben you are indeed correct. Fanie the BB you are looking for has an outer diameter of 86.5mm so using SM-BB91-41A (which has an outer diameter of 92mm) will not work. Link below of where you can get a replacement http://www.chainreac...et/rp-prod61803 Ok thanks, but now i am even more confused. I thought the outer diameter was 41mm. The shell width on the bike is 89.5mm, which means the one CRC has, won't work either as it will be to short at 86.5mm. My understanding is that the difference between the 41A, 41B, etc is the shell width and that the diameter is standard at 41mm. Link to comment Share on other sites More sharing options...
missionS Posted January 6, 2014 Share awesme you are indeed correctApologies for talking out of my @ss fanievb 1 Link to comment Share on other sites More sharing options...
fanievb Posted January 6, 2014 Share awesme you are indeed correctApologies for talking out of my @ss this is damn frustrating and confusing. I might end up taking out the BB and taking it to the LBS to compare and find a replacement (not keen) Link to comment Share on other sites More sharing options...
David Marshall Posted January 6, 2014 Share 41 is the diameter and the 71 and 91 are the series (with Shimano the higher the number, the better the quality (they say!)). The bearing cup sizes are the same so if you can't get the right length you can re use the plastic insert from your old one. fanievb 1 Link to comment Share on other sites More sharing options...
fanievb Posted January 6, 2014 Share 41 is the diameter and the 71 and 91 are the series (with Shimano the higher the number, the better the quality (they say!)). The bearing cup sizes are the same so if you can't get the right length you can re use the plastic insert from your old one. cool so as long as I stick with 41 or 41A I should be ok? Link to comment Share on other sites More sharing options...
MTBc Posted October 23, 2014 Share cool so as long as I stick with 41 or 41A I should be ok? @fanievb - what bb did you get? Mine is getting tired and looking to get a replacement. From what I've read here and on other forums, sounds like a BB71 / BB91 will work. I've found this, thinking it would work in my Giant XTC Composite (2012) and XT crankset.http://www.buycycle.co.za/en/components/mtb-en/bottom-brackets-en/shimano-bb/shimano-bb-m91-pressfit-mtb-shimano.html Any noticeable quality difference between a 71 and 91 series BB? Smoother cranking? Anything on the durability? Edited October 23, 2014 by MTBc Link to comment Share on other sites More sharing options...
fanievb Posted October 23, 2014 Share @fanievb - what bb did you get? Mine is getting tired and looking to get a replacement. From what I've read here and on other forums, sounds like a BB71 / BB91 will work. I've found this, thinking it would work in my Giant XTC Composite (2012) and XT crankset.http://www.buycycle.co.za/en/components/mtb-en/bottom-brackets-en/shimano-bb/shimano-bb-m91-pressfit-mtb-shimano.html Any noticeable quality difference between a 71 and 91 series BB? Smoother cranking? Anything on the durability? I got the 71. Dont really know what the difference is, but as David said above the 91 is supposed to be higher quality, so it may be a bit lighter. my first bb (71) lasted about 3000km, but got busted after a very wet and muddy ride as the small hole on the bottom of the BB got plugged and the mud turned to grinding paste. I got one of these http://www.cwcycles.co.za/product/shimano-press-fit-bb-mtb-sm-bb71 CWC actually had a sale (R199 ea) a while back and I got myself 2 as spares Link to comment Share on other sites More sharing options...
MTBc Posted October 23, 2014 Share yup, 1 too many river crossings. My first BB had about 3000km's too, but this one is packing up after not even 1000. Not sure what I have in at the moment. Thanks for the feedback. Looks like I can pick up 91's for less than CWC's price on the 71. Unless I jump on 1 of their hub request threads fanievb 1 Link to comment Share on other sites More sharing options...
Flowta Posted October 23, 2014 Share I have a Shimano pressfit BB (SM-BB71-41) in/on my Giant XTC, the BB is a bit moeg but i cant find the exact BB and I suspect it may be an OEM specific part (running an SLX hollowtech II crank) My question is if the SM-BB91-41A will fit? A pressfit is a pressfit after all? You will need this one http://www.cwcycles.co.za/product/shimano-press-fit-bb-mtb-sm-bb71 MTBc 1 Link to comment Share on other sites More sharing options...
fanievb Posted October 23, 2014 Share yup, 1 too many river crossings. My first BB had about 3000km's too, but this one is packing up after not even 1000. Not sure what I have in at the moment. Thanks for the feedback. Looks like I can pick up 91's for less than CWC's price on the 71. Unless I jump on 1 of their hub request threads yip check them holes and make sure ALL the water is out. just a tip, when you install the new put some grease on the outside of the cups, you'll thank yourself when you need to replace it again one day. Link to comment Share on other sites More sharing options...
EVOBIKES ONLINE STORE Posted October 23, 2014 Share In stock from us at R295 each... http://www.evobikes.co.za/components/bottom-brackets/shimano-bottom-bracket-sm-bb71-41a.html Morwa, fanievb and MTBc 3 Link to comment Share on other sites More sharing options...
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