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Winton Historic Racing, May 2021 Luis Gallur
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<blockquote data-quote="davidd" data-source="post: 139389" data-attributes="member: 1177"><p>The RFM can be lightened quite a bit. I get them down to 12 lbs. bare. Patrick uses Plastic in the RFM pivot. The taper rollers are strong, but they are very heavy. Ceramic hybrids for the wheel bearings will cut some weight, also and the rolling resistance is very low.</p><p></p><p>[ATTACH=full]42131[/ATTACH]</p><p></p><p>The aluminum steering head cuts the weight in half, but it tends to require the FT1/4 style of connection to the head lug, which is probably the weakest. If you cnc the headstock the rake can be steepened and the connection to the head can be strengthened considerably with an improved connection.</p><p></p><p>Chrome molly can be used for the headstock instead. It is strong and about the same weight as aluminum because the aluminum needs a sturdy design to deal with the bending forces.</p><p></p><p>Dave Tompkin's bike lost quite a bit of weight this winter. It is down to 265 lbs., but he uses a lot of titanium. I hope to get mine down to 270 lbs. with no titanium. Most of the weight loss on Dave's came from getting rid of the fuel tank and its capacity. I ran a 1.25 gal. tank, which would do any race on the schedule. You can't do that at the TT, but on these short races, it saves about 15 lbs. The seat is another heavy component when you add in the metal tube supporting it. Mine is about 2 lbs.</p><p></p><p>[ATTACH=full]42132[/ATTACH]</p><p></p><p>I mentioned to Dave that he should cut off the ends of his fork spindles as Patrick does. He resisted, at first, but the lure of "lightweight" got to him.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 139389, member: 1177"] The RFM can be lightened quite a bit. I get them down to 12 lbs. bare. Patrick uses Plastic in the RFM pivot. The taper rollers are strong, but they are very heavy. Ceramic hybrids for the wheel bearings will cut some weight, also and the rolling resistance is very low. [ATTACH type="full"]42131[/ATTACH] The aluminum steering head cuts the weight in half, but it tends to require the FT1/4 style of connection to the head lug, which is probably the weakest. If you cnc the headstock the rake can be steepened and the connection to the head can be strengthened considerably with an improved connection. Chrome molly can be used for the headstock instead. It is strong and about the same weight as aluminum because the aluminum needs a sturdy design to deal with the bending forces. Dave Tompkin's bike lost quite a bit of weight this winter. It is down to 265 lbs., but he uses a lot of titanium. I hope to get mine down to 270 lbs. with no titanium. Most of the weight loss on Dave's came from getting rid of the fuel tank and its capacity. I ran a 1.25 gal. tank, which would do any race on the schedule. You can't do that at the TT, but on these short races, it saves about 15 lbs. The seat is another heavy component when you add in the metal tube supporting it. Mine is about 2 lbs. [ATTACH type="full"]42132[/ATTACH] I mentioned to Dave that he should cut off the ends of his fork spindles as Patrick does. He resisted, at first, but the lure of "lightweight" got to him. David [/QUOTE]
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Winton Historic Racing, May 2021 Luis Gallur
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