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Tech. Advice: Series 'A' 500cc/1000cc Bikes
Restoring the last of the series "A" Comets.
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<blockquote data-quote="greg brillus" data-source="post: 80999" data-attributes="member: 597"><p>Thanks for the replies so far......Yes the hubs are very close to post war ones, and VERY HEAVY. I'm guessing this was an attempt at producing a simpler design over the earlier multi piece alloy/steel hubs that are more common, an I do have one and a half of those types that came with this bike in the boxes of spares that came with it. Because we only have the one, I am getting my machinist to make a copy for the front. Tim suggested I get more made up for some spares if others need them, but I'm thinking that because they were only used on the last of the pre-war bikes there may be no demand for them. Any thoughts....? One small point of interest about these hubs, where the hub bolts pass through and the nuts screw onto the threads, if you use the 5/16 BSF nyloc nuts as per normal, the points of the nuts hit the hub as the nuts are turned. This would suggest to me that perhaps they used a nut with smaller hex size like the ones on the built up hubs of earlier, though I'm not sure these are available in a self locking nut or whether they used thin section spring washers under the heads. I also noticed on the rear drum/sprocket that it uses the normal 10 bolt set up, is this right or should it be a 5 bolt pattern. These last built bikes seem to have gone though some minor changes perhaps as the factory were refining some ideas that passed on to the post war bikes, remembering post war that alloy was plentiful whereas steel was not. Before I assemble up the hubs I will take some good pictures of them and somehow put them on here for you to see. Cheers..........Greg.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 80999, member: 597"] Thanks for the replies so far......Yes the hubs are very close to post war ones, and VERY HEAVY. I'm guessing this was an attempt at producing a simpler design over the earlier multi piece alloy/steel hubs that are more common, an I do have one and a half of those types that came with this bike in the boxes of spares that came with it. Because we only have the one, I am getting my machinist to make a copy for the front. Tim suggested I get more made up for some spares if others need them, but I'm thinking that because they were only used on the last of the pre-war bikes there may be no demand for them. Any thoughts....? One small point of interest about these hubs, where the hub bolts pass through and the nuts screw onto the threads, if you use the 5/16 BSF nyloc nuts as per normal, the points of the nuts hit the hub as the nuts are turned. This would suggest to me that perhaps they used a nut with smaller hex size like the ones on the built up hubs of earlier, though I'm not sure these are available in a self locking nut or whether they used thin section spring washers under the heads. I also noticed on the rear drum/sprocket that it uses the normal 10 bolt set up, is this right or should it be a 5 bolt pattern. These last built bikes seem to have gone though some minor changes perhaps as the factory were refining some ideas that passed on to the post war bikes, remembering post war that alloy was plentiful whereas steel was not. Before I assemble up the hubs I will take some good pictures of them and somehow put them on here for you to see. Cheers..........Greg. [/QUOTE]
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Tech. Advice: Series 'A' 500cc/1000cc Bikes
Restoring the last of the series "A" Comets.
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