OzVMX Forum

Clubroom => Tech Talk => Topic started by: micko on May 03, 2017, 09:44:58 pm

Title: Rear hub difference RM250A/B/C
Post by: micko on May 03, 2017, 09:44:58 pm

Apart from bearing sizes is there a difference, are they all magnesium ?

Title: Re: Rear hub difference RM250A/B/C
Post by: LWC82PE on May 03, 2017, 10:16:02 pm

They are all aluminium as shipped on the bikes from factory. There were optional magnesium rear hubs for the 76 and for the 77/78

To convert the 76 hub to use 17mm axle use bearings  KOYO DG1742RSC3 - 17X42X13  (they are only available with a seal on one side)
To convert 77/78 hub to 15mm axle use bearings  SKF 361202 15x40x11 with a 2mm shim or machine out the hub to use the stock 76 bearings which are 6302   15X42X13

Title: Re: Rear hub difference RM250A/B/C
Post by: micko on May 04, 2017, 02:57:03 pm

Thanks for the info

Title: Re: Rear hub difference RM250A/B/C
Post by: 211 on May 04, 2017, 03:38:30 pm

some of the very first RM A series used the left over RH/RN parts bin and I have seen a few with the tel tail 400000 part number sand cast into the hub (inside)
keep your eyes out for that one