georges Posted July 18, 2014 Posted July 18, 2014 Please would someone provide me with the wheel size in mm for 27.5 wheels using Scwalbe Racing Ralph 27.5 2.25. (57-584) Not shown in owners manual. Thanks.
Spinnekop Posted July 18, 2014 Posted July 18, 2014 Go measure it!? rouxtjie, Carpediem and slowashell 3
rouxtjie Posted July 18, 2014 Posted July 18, 2014 Please would someone provide me with the wheel size in mm for 27.5 wheels using Scwalbe Racing Ralph 27.5 2.25. (57-584) Not shown in owners manual. Thanks.Measure it yourself since wear might make it less or more...depending on condition. OR do what most of us do and just let the GPS calculate your distance...its not out by much GLuvsMtb, Pure Savage and Carpediem 3
georges Posted July 18, 2014 Author Posted July 18, 2014 Go measure it!? Have a laugh first and then tell me how.thanks.
georges Posted July 18, 2014 Author Posted July 18, 2014 Measure it yourself since wear might make it less or more...depending on condition. OR do what most of us do and just let the GPS calculate your distance...its not out by much Did this but I checked out of curiosity and found it showed 2096 which is incorrect. thanks.
georges Posted July 18, 2014 Author Posted July 18, 2014 Did this but I checked out of curiosity and found it showed 2096 which is incorrect. thanks. Sorry, I should have said put it on "Auto"
Spinnekop Posted July 18, 2014 Posted July 18, 2014 Have a laugh first and then tell me how.thanks. Hahhaha.Bike on 'n straight line. Valve at the bottom. Mark. Roll bike forward untill valve is at the bottom again. Measure distance betwee the two marks rouxtjie 1
georges Posted July 18, 2014 Author Posted July 18, 2014 Hahhaha.Bike on 'n straight line. Valve at the bottom. Mark. Roll bike forward untill valve is at the bottom again.Measure distance betwee the two marks Thank you
@ndy Posted July 18, 2014 Posted July 18, 2014 Georges, Find a long room. Mark your wheel and the floor with a bit of tape or something similar. Line up the tape on the wheel with the tape on the floor. Slowly ride along the room and stop when the tape on the wheel reaches the floor again. Mark that spot and measure between the two marks. If you are lucky enough to have a long enough area for more than one revolution then your measurement accuracy increases. I do it sitting on the bike with my normal tyre pressure just to be sure I get the most accurate result I can. Hope this helps.
georges Posted July 18, 2014 Author Posted July 18, 2014 Georges, Find a long room. Mark your wheel and the floor with a bit of tape or something similar. Line up the tape on the wheel with the tape on the floor. Slowly ride along the room and stop when the tape on the wheel reaches the floor again. Mark that spot and measure between the two marks. If you are lucky enough to have a long enough area for more than one revolution then your measurement accuracy increases. I do it sitting on the bike with my normal tyre pressure just to be sure I get the most accurate result I can. Hope this helps. Thanks.
neverenufpower Posted July 18, 2014 Posted July 18, 2014 Best to do 2 rotations and device by 2. Will be more accurate.
Spoke101 Posted July 18, 2014 Posted July 18, 2014 I don't want to through a spanner in the works, but this has just popped in to my head. What about the flat spot where the tyre and the ground meet once rider weight is added? surly this will affect circumference by a few mm every rotation?
travisza Posted July 18, 2014 Posted July 18, 2014 I don't want to through a spanner in the works, but this has just popped in to my head. What about the flat spot where the tyre and the ground meet once rider weight is added? surly this will affect circumference by a few mm every rotation?Oh. My. God. Does that mean even ride I've ever done is out by thousands of mm? Note to self. Don't wheel bike across living room when measuring wheel circumference...rather ride it Pusher, Spoke101 and MTBc 3
Spoke101 Posted July 18, 2014 Posted July 18, 2014 Oh. My. God. Does that mean even ride I've ever done is out by thousands of mm? Note to self. Don't wheel bike across living room when measuring wheel circumference...rather ride itIt was in jest, maybe should have added a few of these.
scotty Posted July 18, 2014 Posted July 18, 2014 I don't want to through a spanner in the works, but this has just popped in to my head. What about the flat spot where the tyre and the ground meet once rider weight is added? surly this will affect circumference by a few mm every rotation?What if there is a plug or 2, this could also affect it. Spoke101 and MTBc 2
TK-Sp3cialiSt Posted July 18, 2014 Posted July 18, 2014 (edited) Why not just use satellite speed? On auto setting it will adjust your speed sensor to be more accurate Edited July 18, 2014 by TK-Sp3cialiSt
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