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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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<blockquote data-quote="davidd" data-source="post: 95450" data-attributes="member: 1177"><p>I believe that Norman has stated that the JE stem that he makes is not designed for side car work. The design that I use is designed for side car or solo use. Jim Young has used it on the side car rig he is currently building and Oldhaven was kind enough to do some trail calculations on his CAD set up. It was pointed out that sometimes the use of a short link with an eccentric in the side car position and my steering stem can cause the trail to go negative. This is not unusual when a short top link is installed, it is just important to know how much trail you want. There are too many tire and wheel combinations being used to know ahead of time.</p><p></p><p>There are quite a few short links around and almost all of them are different lengths. This means you have to do some trail calculations if you are using an unfamiliar top link. I suspect the side car men wanted less trail than the eccentric allowed in the side car position and went to a shorter top link to get nearer to zero. That would be where the easier steering would be. Although the new stems do not change the rake, they can change the trail. </p><p></p><p>If I were using one of my stems on a side car rig I would just turn the eccentric to the side car position and run it. </p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 95450, member: 1177"] I believe that Norman has stated that the JE stem that he makes is not designed for side car work. The design that I use is designed for side car or solo use. Jim Young has used it on the side car rig he is currently building and Oldhaven was kind enough to do some trail calculations on his CAD set up. It was pointed out that sometimes the use of a short link with an eccentric in the side car position and my steering stem can cause the trail to go negative. This is not unusual when a short top link is installed, it is just important to know how much trail you want. There are too many tire and wheel combinations being used to know ahead of time. There are quite a few short links around and almost all of them are different lengths. This means you have to do some trail calculations if you are using an unfamiliar top link. I suspect the side car men wanted less trail than the eccentric allowed in the side car position and went to a shorter top link to get nearer to zero. That would be where the easier steering would be. Although the new stems do not change the rake, they can change the trail. If I were using one of my stems on a side car rig I would just turn the eccentric to the side car position and run it. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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