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1689 Views 14 Replies 6 Participants Last post by  Pete Casper
I have an interesting question. A friend of mine who is rebuilding a R75 BMW into an awesome steet bike showed me a neat trick. He put a spare lower triple tree fork brace (with stem and excess metal shaved off) on about halfway between the working lower triple tree bracket and the fender bracket/brace. I thought this was a neat idea to really make the front end tight and reduce flex. He swears that it works and I believe him. Anyone ever try this on their CB350 or is it just not needed if you have a good fender bracket/fork brace?


Ask not what the wanker can do for you, but what you can do for your wanker!
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Basically what he built was a tweak bar. Tweak bars are what chopper guys in the 70's use to keep their extended front ends from flexing.

Does it work? well some of the larger 70's superbike racers used to use extenders to the triple clamp to keep their front ends from flexing (you see this most on kz900s and kz1000s) during cornering so there is some thing to it. basically you are giving the bike the rigidity of a really short front end without changing rake or trail, meaning the tubes are less likely to flex and when they do they flex in unison. However it does not work as well as well as a real foke brace which attaches to the sliders since the sliders are the more dynamic part of the front end. In addition a tweak bar can have the effect of causing the sliders to flex out of alignment more since they are now having to absorb more of the cornering flex.

Personally I think on a street bike a tweak bar is useless, or worth less than a real slider brace because road surfaces tend to be rougher than track surfaces and that extra flex give you a little extra suspension effect. On a race bike it would make more sense because it would be used in conjunction with a slider brace. Your friend made his out of an old bottom clamp which to me is a heavy lump of shit. In my opinion it sounds like it is more weight than it is worth.
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tried making the link work but all it does is trigger my mail client (the @ symbol in the link does that). Working on it, I'll get back to ya.
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