chaser Posted April 11, 2016 Report Share Posted April 11, 2016 I have the 2011 280i and it appears to only run one bearing on the disc side, which I have replaced. I see there is a conversion kit to upgrade to a 2 bearing type but can`t find anyone that has it in stock. Anyone know where I can obtain this kit at a reasonable cost with shipping to the UK ? Quote Link to comment Share on other sites More sharing options...
tcrhino Posted April 12, 2016 Report Share Posted April 12, 2016 The conversion kit was issued to replace the chain side plain bearing by double ball bearing. Does your 2011 still have that plain bearing (look closely as there is a sleeve used on that side as well)? There is no need for double bearings on the brake disc side. 1 Quote Link to comment Share on other sites More sharing options...
peterb Posted April 12, 2016 Report Share Posted April 12, 2016 Hi chaser, there was a kit made available for the 2011 first release Ossa's, that comprised of two ball bearing's and a sleeve to take up the difference between the bearing housing and the OD of the new bearings. Both bearings and sleeve were for the chain drive side, to replace the teflon bush there. Before these became available, we modified our Ossa's to take a single 6004 bearing. The wheels were centralised on a mill table and the housing milled out to accept the 6004 bearing. This might be the way to go should the kits no longer be available. Bye, Peter B. 1 Quote Link to comment Share on other sites More sharing options...
chaser Posted April 12, 2016 Author Report Share Posted April 12, 2016 The conversion kit was issued to replace the chain side plain bearing by double ball bearing. Does your 2011 still have that plain bearing (look closely as there is a sleeve used on that side as well)? There is no need for double bearings on the brake disc side. I am sure I still have the original setup, there is a bearing on the disc side, which I have replaced, but the chain side is a tube affair with a spindle that passes through it. A conversion kit would be good if I could get one. Trials and Tribulations list it on their site but it`s saying sold out. Would another wheel from a different bike fit ? Gasgas maybe ? Quote Link to comment Share on other sites More sharing options...
lotus54 Posted April 13, 2016 Report Share Posted April 13, 2016 Email Trials and Tribulations and see if they can still get it. Otherwise modding your existing wheels seems the best bet to me. 1 Quote Link to comment Share on other sites More sharing options...
peterb Posted April 13, 2016 Report Share Posted April 13, 2016 Hi chaser, for the time being, you can knock out the LHS bush and replace it with a new one, it is a shouldered type DU teflon lined bush generally available from good bearing shops, probably only a few pound in the UK. Should never have been supplied in the first instance. If you don't want to head down the milling track, which is the best option as then you can use a decent sized 6004 bearing like what should have been used originally, you can have someone turn up a sleeve to take up the difference between the two new kit bearings, I can't remember the size but they were a smaller OD than a 6004, and the bearing housing, shorten the aluminium bearing separator sleeve (the sleeve in between the left and right bearings) to the appropriate length, then fit everything together packing the new bearings with waterproof grease. I did get a GG year 2000 rear wheel to fit as a spare, but this was a lot of mucking around with spacers, sleeves and getting the longitudinal distance correct for the sprocket and disc. I don't think a Pro wheel would fit, might do, best to try one first, but the Pro axle is a smaller diameter than the Ossa, and the Ossa has a very tight tolerance for the caliper distance away from the swinging arm, different to a GG. Best bet is to get the hub milled out and then it's all done proper like. Bye, Peter B. 1 Quote Link to comment Share on other sites More sharing options...
chaser Posted April 13, 2016 Author Report Share Posted April 13, 2016 Thanks for the replies guys, it seems ok at the moment, as I am repacking with grease on a regular basis, but I know it will be an issue in the future. The mod to accept a proper bearing seems the way to go. Quote Link to comment Share on other sites More sharing options...
lotus54 Posted April 13, 2016 Report Share Posted April 13, 2016 Don't forget to check with Adrian at Lewisport http://www.lewisportusa.com Phone call seems most effective. Mark Quote Link to comment Share on other sites More sharing options...
chaser Posted May 9, 2016 Author Report Share Posted May 9, 2016 Finally got around to fixing the rear wheel bearing issue. Had the hub machined to take a 6004 bearing and the original spacer/sleeve/bush affair cut down to make the spacer sleeve and the outer spacer. Works fine Quote Link to comment Share on other sites More sharing options...
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