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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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<blockquote data-quote="timetraveller" data-source="post: 98672" data-attributes="member: 456"><p>Shortening the spring cases has been important on the few bikes I have actually worked with this mod. Because the new centre of rotation for the lower link is now about one inch below where it was, the shortened spring boxes don't look out of place. Even on a stripped down racing twin with 33 lb spring the outer spring box was hitting the fork leg when braking hard and with a bump.</p><p>I do wonder about the use of a Vincent damper with the long eyebolts. The Vincent damper is longer than the Armstrong, hence the use of the longer eyebolts on the Ds. When I was playing about with the geometry of the new system in combination with the new springs and dampers the combined length of the damper and eyebolts is one of the limiters for the range of travel over which the new geometry works. Without the springs, and by replacing the front wheel spindle with either a rear one or a felt tip marker, one can move the wheel up and down and produce a track on a suitably supported sheet of plywood, or similar, and actually see the movement path of the front wheel. At the moment there is clearly some disagreement as to what the best combination of springs and dampers is for various weights of bike and rider. The total travel available was carefully developed and anyone who alters the range of movement on their own bike is into unknown territory and is responsible for their own safety.</p><p>Whilst sitting here in the high temperature and humidity I have had chance to think about some of these matters and will write more fully when back in front of a PC.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 98672, member: 456"] Shortening the spring cases has been important on the few bikes I have actually worked with this mod. Because the new centre of rotation for the lower link is now about one inch below where it was, the shortened spring boxes don't look out of place. Even on a stripped down racing twin with 33 lb spring the outer spring box was hitting the fork leg when braking hard and with a bump. I do wonder about the use of a Vincent damper with the long eyebolts. The Vincent damper is longer than the Armstrong, hence the use of the longer eyebolts on the Ds. When I was playing about with the geometry of the new system in combination with the new springs and dampers the combined length of the damper and eyebolts is one of the limiters for the range of travel over which the new geometry works. Without the springs, and by replacing the front wheel spindle with either a rear one or a felt tip marker, one can move the wheel up and down and produce a track on a suitably supported sheet of plywood, or similar, and actually see the movement path of the front wheel. At the moment there is clearly some disagreement as to what the best combination of springs and dampers is for various weights of bike and rider. The total travel available was carefully developed and anyone who alters the range of movement on their own bike is into unknown territory and is responsible for their own safety. Whilst sitting here in the high temperature and humidity I have had chance to think about some of these matters and will write more fully when back in front of a PC. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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