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Tech. Advice: Series 'A' 500cc/1000cc Bikes
Saddle Springs - Series A (and other pre-war bikes)
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<blockquote data-quote="A_HRD" data-source="post: 99011" data-attributes="member: 49"><p>I was following a guy on a Series A the other day and was struck by the amount his 'derriere' was moved off-centre by the action of the two coil-springs on the rear of the saddle. Rather than bouncing vertically up and down, the rear of the saddle was moving way off to the right the further it got compressed. This must be doing nothing good for the stressed saddle components, nor for the quality of the ride. </p><p></p><p>The reason is quite simple; the 2 springs are wound in the same direction so encourage the above scenario. If they were each wound in opposite directions then the problem would cancel-out. </p><p></p><p>So my question is: did Series As <strong>originally</strong> have contra-wound springs or not? Further, I have noticed various different fixing styles - which is correct? Anyone got a photo of a correct spring pair? </p><p></p><p>Regardless of the answer, I would like to get a few contra-wound pairs made (using increased wire diameter to account for demographic weight increase!). Anyone know a good UK spring company who is up to this small-scale task please? Anyone interested in having a pair? </p><p></p><p>Peter B</p></blockquote><p></p>
[QUOTE="A_HRD, post: 99011, member: 49"] I was following a guy on a Series A the other day and was struck by the amount his 'derriere' was moved off-centre by the action of the two coil-springs on the rear of the saddle. Rather than bouncing vertically up and down, the rear of the saddle was moving way off to the right the further it got compressed. This must be doing nothing good for the stressed saddle components, nor for the quality of the ride. The reason is quite simple; the 2 springs are wound in the same direction so encourage the above scenario. If they were each wound in opposite directions then the problem would cancel-out. So my question is: did Series As [B]originally[/B] have contra-wound springs or not? Further, I have noticed various different fixing styles - which is correct? Anyone got a photo of a correct spring pair? Regardless of the answer, I would like to get a few contra-wound pairs made (using increased wire diameter to account for demographic weight increase!). Anyone know a good UK spring company who is up to this small-scale task please? Anyone interested in having a pair? Peter B [/QUOTE]
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Tech. Advice: Series 'A' 500cc/1000cc Bikes
Saddle Springs - Series A (and other pre-war bikes)
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