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The Classic MotorCycle - Letters
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<blockquote data-quote="Simon Dinsdale" data-source="post: 123389" data-attributes="member: 58"><p>Don't get straight seat stay lugs confused with short RFM's, series B RFM's etc as you can get a longer intermediate RFM which has the later removable rear brake abutment for use on singles and twins but still has the straight seat stay brackets. Also all of the design changes to the RFM in 1949 had nothing to do with series B or C as the design changes were subjected to both B & C at the same time.</p><p></p><p>Also there is no such thing as a shorter series B RFM as the first 4 months of series C bikes were also fitted with the earlier type RFM so the B tag is wrong even though we all use it. Just the same when assuming the curved sear stay RFM is series C when the last 8 months production of series B machines used the curved seat stay RFM.</p><p></p><p>The prototype B Meteor & C Comet were produced in late 1948 and had used some strange fittings to get round the RFM problem (and others) at the time. It was then 9 months later that the first production singles were made which gave the factory time to sort all these problems out.</p><p></p><p>Also the increase in length of the RFM had nothing to do with any of the above. The reason for that was the introduction of the Black Lightning which used a larger 20" diameter rear wheel whch meant the tyre got dangerously close to the front of the mudguard, especially at speed hence the factory took the oppotunity to lengthen the RFM at the same time as the other changes. This meant the assembly jigs needed alterning and so the older shorter design could no longer be made which is why the changes were introduced across the whole production range at the same time.</p><p></p><p>Simon</p></blockquote><p></p>
[QUOTE="Simon Dinsdale, post: 123389, member: 58"] Don't get straight seat stay lugs confused with short RFM's, series B RFM's etc as you can get a longer intermediate RFM which has the later removable rear brake abutment for use on singles and twins but still has the straight seat stay brackets. Also all of the design changes to the RFM in 1949 had nothing to do with series B or C as the design changes were subjected to both B & C at the same time. Also there is no such thing as a shorter series B RFM as the first 4 months of series C bikes were also fitted with the earlier type RFM so the B tag is wrong even though we all use it. Just the same when assuming the curved sear stay RFM is series C when the last 8 months production of series B machines used the curved seat stay RFM. The prototype B Meteor & C Comet were produced in late 1948 and had used some strange fittings to get round the RFM problem (and others) at the time. It was then 9 months later that the first production singles were made which gave the factory time to sort all these problems out. Also the increase in length of the RFM had nothing to do with any of the above. The reason for that was the introduction of the Black Lightning which used a larger 20" diameter rear wheel whch meant the tyre got dangerously close to the front of the mudguard, especially at speed hence the factory took the oppotunity to lengthen the RFM at the same time as the other changes. This meant the assembly jigs needed alterning and so the older shorter design could no longer be made which is why the changes were introduced across the whole production range at the same time. Simon [/QUOTE]
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