djsb 493 Posted July 9, 2018 Share Posted July 9, 2018 What do the various bearing dimensions refer to? I particularly refer to the bearings on the swingarm. There are 30x37x20 (23 and 24 (Is 23 the same size as 24? ) below), ((21 below)17x24x30 needle bearings and one 20x37x9 (22 below) ball bearing. I'm guessing that the middle dimension is the OUTER diameter as the dust seal and needle bearing that are seated next to each other have the same 37mm diameter. If this is the case am I correct in assuming that the first number is the INNER diameter (is that the ACTUAL diameter of the needles or is it the diameter of the collar it is meant to accomodate?). And is the smallest dimension the width of the bearing? I hope someone can clear up my confusion. Thanks. https://www.bike-parts-honda.com/honda-motorcycle/750-MOTO/NC/2014/NC750XDE/Frame/SWINGARM-CHAIN-CASE/71541/F_26/2/19298 Link to post
arengle 449 Posted July 9, 2018 Share Posted July 9, 2018 Inner(bore) X Outer X Width. this is how they publish the numbers for bearings. 1 Link to post
embee 7,288 Posted July 9, 2018 Share Posted July 9, 2018 (edited) Most bearing stockists list bearings by reference number but you can select them by dimensions, for example select needle roller bearings at https://www.bearingsrus.co.uk/bearings then select drawn cup needle bearings and 30 bore, 37 outside dia, and 20 length to get this https://www.bearingsrus.co.uk/bearings/needle-roller/drawn-cup-needle-roller-bearings/hk3020-skf The bore of the needle bearing is the diameter of the shaft/sleeve it runs on. The bore of a deep groove ball bearing for example is the size of the shaft/spindle it fits over. Note there are often versions with seals included, as used in the linkage system. I've used that supplier many times with excellent service. Edited July 9, 2018 by embee 2 Link to post
djsb 493 Posted July 9, 2018 Author Share Posted July 9, 2018 Also I wonder why there is only one ball bearing and why is it on the right? Seems a bit unbalanced. Link to post
embee 7,288 Posted July 9, 2018 Share Posted July 9, 2018 The principal loads in the swingarm pivot are carried by the needle rollers, the single ball bearing is there to locate it and stop sideways movement. 2 Link to post
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