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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Wheel bearings.
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<blockquote data-quote="davidd" data-source="post: 132600" data-attributes="member: 1177"><p>The biggest downside is that there is not much of an upside. As Greg points out, it is a lot of work to convert and shim a Vincent because it has not been commonly done. </p><p></p><p>For me, the upside was running ceramic bearing on a machine that needed every edge to get a record at Bonneville. It was worth the effort because it was easier to lower the rolling resistance than increase the BHP even a small amount. </p><p></p><p>I would consider the imperial Timken bearings, narrow and wide, to be the stock bearing set-up. However, there seem to be a lot of metric wheel bearings in service. The metric hubs were machined to 47 mm to accommodate the smaller diameter metric bearing. When the race is installed it often looks like there is a spacer behind the bearing race, but there is not. I have not measured the separation of the bearing pockets, but, the metric bearing required a spacer to hold the brake plate out a bit, so I don't think the pockets were moved out very far, if at all.</p><p></p><p>The metric hubs used a metric hollow axle for the 20 mm bearing ID, which would still allow the use of the 1/2" steel axle and the E80 nuts.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 132600, member: 1177"] The biggest downside is that there is not much of an upside. As Greg points out, it is a lot of work to convert and shim a Vincent because it has not been commonly done. For me, the upside was running ceramic bearing on a machine that needed every edge to get a record at Bonneville. It was worth the effort because it was easier to lower the rolling resistance than increase the BHP even a small amount. I would consider the imperial Timken bearings, narrow and wide, to be the stock bearing set-up. However, there seem to be a lot of metric wheel bearings in service. The metric hubs were machined to 47 mm to accommodate the smaller diameter metric bearing. When the race is installed it often looks like there is a spacer behind the bearing race, but there is not. I have not measured the separation of the bearing pockets, but, the metric bearing required a spacer to hold the brake plate out a bit, so I don't think the pockets were moved out very far, if at all. The metric hubs used a metric hollow axle for the 20 mm bearing ID, which would still allow the use of the 1/2" steel axle and the E80 nuts. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Wheel bearings.
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