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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Fit of RFM between FT5 and G50
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<blockquote data-quote="davidd" data-source="post: 108830" data-attributes="member: 1177"><p>I don't think that my part is molested, but it is a used original. I have copied it several times in aluminum, but most of my builds are not stock, so it is difficult to compare.</p><p></p><p>Having measured many hollow axles, I don't think that they are built to the drawing except in the most critical areas. Some have undercuts at the shoulder, some do not. The shoulders themselves are various widths (although the distance between the shoulders is more accurate. The center diameters vary on most. They all seem to work well.</p><p></p><p>If you buy one at a jumble it is difficult to know which position it is destined for if the seller is not certain:</p><p>[ATTACH=full]28343[/ATTACH]</p><p>All of the above are stock. There are two more for the front stand pivots, but they are easily distinguished.</p><p></p><p>The easy ones to pick out of the bunch are the metric hollow axles. They have "step downs" from the bearing pad, which is .786" or 20mm to the stock brake plate hole of .75". It is very obvious on the rear axle at the bottom and less obvious (but identifiable) on the second axle from the top, which is metric. The RFM pivot is the middle hollow axle.</p><p></p><p>The imperial bearings, narrow or wide, use the same hollow axle. As a result, the narrow bearing has to be positioned in a way so the hollow axle works with the spacing of the narrow bearings widened out to fit the wide bearing hollow axle. As Chankly mentioned, two spacers are needed: one under the race at 1/8" width to compensate for the narrow race, and one under, or in between the brake plate and the bearing cone to compensate for the narrow cone.</p><p>[ATTACH=full]28344[/ATTACH]</p><p>I could not find a cone easily, but the important items are the spacers, which may be in a box of bits, but remain unrecognized.</p><p></p><p>Narrow:</p><p>[ATTACH=full]28345[/ATTACH]</p><p></p><p>Wide:</p><p>[ATTACH=full]28346[/ATTACH]</p><p></p><p>I would wonder if the E80 nuts are at different positions on each side because the shims were not split between the two sides? </p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 108830, member: 1177"] I don't think that my part is molested, but it is a used original. I have copied it several times in aluminum, but most of my builds are not stock, so it is difficult to compare. Having measured many hollow axles, I don't think that they are built to the drawing except in the most critical areas. Some have undercuts at the shoulder, some do not. The shoulders themselves are various widths (although the distance between the shoulders is more accurate. The center diameters vary on most. They all seem to work well. If you buy one at a jumble it is difficult to know which position it is destined for if the seller is not certain: [ATTACH type="full" alt="DSCN3615.jpg"]28343[/ATTACH] All of the above are stock. There are two more for the front stand pivots, but they are easily distinguished. The easy ones to pick out of the bunch are the metric hollow axles. They have "step downs" from the bearing pad, which is .786" or 20mm to the stock brake plate hole of .75". It is very obvious on the rear axle at the bottom and less obvious (but identifiable) on the second axle from the top, which is metric. The RFM pivot is the middle hollow axle. The imperial bearings, narrow or wide, use the same hollow axle. As a result, the narrow bearing has to be positioned in a way so the hollow axle works with the spacing of the narrow bearings widened out to fit the wide bearing hollow axle. As Chankly mentioned, two spacers are needed: one under the race at 1/8" width to compensate for the narrow race, and one under, or in between the brake plate and the bearing cone to compensate for the narrow cone. [ATTACH type="full" alt="DSCN3644.jpg"]28344[/ATTACH] I could not find a cone easily, but the important items are the spacers, which may be in a box of bits, but remain unrecognized. Narrow: [ATTACH type="full" alt="67 & 95 Narrow.PNG"]28345[/ATTACH] Wide: [ATTACH type="full" alt="74 & 96 Timkens Wide.PNG"]28346[/ATTACH] I would wonder if the E80 nuts are at different positions on each side because the shims were not split between the two sides? David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Fit of RFM between FT5 and G50
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