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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Mongrel
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<blockquote data-quote="Cyborg" data-source="post: 99833" data-attributes="member: 3426"><p>Just wondering if you or anyone else has any comments regarding swing arm angle. I haven't done the final calculation for rear wheel suspension travel, but loosely based on Ducati Monster geometry, it will be somewhere in the ballpark of 144mm. That may be reduced but better to explain that later. I am just about to tack together a rats nest of tubes and brackets that support the shock rocker, but I haven't made a mounting bracket that locates the bottom of the shock to the swing arm. Before I do that I need to have everything else tacked in place and sort out ride height etc etc. So my question is.... Do I take the centreline between the countershaft, swing arm pivot point, and rear axle... then split the difference? As in 72mm of travel above the centreline and 72mm below. I'm thinking I should subtract whatever the sag will be (say 30mm), so take the remainder and split that above and below the centreline. So I would end up with 57mm above and 87 (57mm + 30) below. That way the drive chain slack would be more consistent while under way.</p><p></p><p>The shock fork that connects the rocker to the swing arm has heim joints on either end, so a little more adjustability than the Ducati setup which only has the joints on one end. I may try and build in some more adjustment into the lower shock mount as well. Might come in handy if rake and trail differ much from the initial calculations.</p></blockquote><p></p>
[QUOTE="Cyborg, post: 99833, member: 3426"] Just wondering if you or anyone else has any comments regarding swing arm angle. I haven't done the final calculation for rear wheel suspension travel, but loosely based on Ducati Monster geometry, it will be somewhere in the ballpark of 144mm. That may be reduced but better to explain that later. I am just about to tack together a rats nest of tubes and brackets that support the shock rocker, but I haven't made a mounting bracket that locates the bottom of the shock to the swing arm. Before I do that I need to have everything else tacked in place and sort out ride height etc etc. So my question is.... Do I take the centreline between the countershaft, swing arm pivot point, and rear axle... then split the difference? As in 72mm of travel above the centreline and 72mm below. I'm thinking I should subtract whatever the sag will be (say 30mm), so take the remainder and split that above and below the centreline. So I would end up with 57mm above and 87 (57mm + 30) below. That way the drive chain slack would be more consistent while under way. The shock fork that connects the rocker to the swing arm has heim joints on either end, so a little more adjustability than the Ducati setup which only has the joints on one end. I may try and build in some more adjustment into the lower shock mount as well. Might come in handy if rake and trail differ much from the initial calculations. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Mongrel
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