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Guest motorhead1977

I would have responded but I was busy filing a patent based on the photos of the thing. Now, to collect my licensing fees................... :biggrin: :goofy:

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Drat, I'm too late. I was going to guess that it was a holder for the idler pulley on the belt drive - even though Larry said he wasn't going to use one...

Now that the cat's out of the bag, how about some more pics and details?

Belt drive mod is still on hold for a 166 tooth 11mm pitch Gates Poly Chain...

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Whats the weight difference between the two?

You know what they say about a stiff swingarm.

I was going to ask that as well. As there are some minor differences (untrained eye here), so I imagine that there must be a significant weight difference, other wise, why bother, no?

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Whats the weight difference between the two?

You know what they say about a stiff swingarm.

The HRC aluminum swingarm is stiffer internally with more webs to

resist the loads during the rigors of WSBK racing but it actually

weights in less due to it's extensive use of aluminum and titanium

bits... the holy grail for us RC45 owners is the HRC magnesium

swingarm which weights an whooping 3 lbs less...

HRC Swingarm with internal webs...

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Stock RC45 Swingarm without the extra internal webs...

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Very nice work. What is the advantage of moving the linkage mount aft on the HRC version? The only thing I can think of is that it would allow the use of longer dog bones (longer lever) without losing ride height...actually wouldn't that allow for higher rear ride height?

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Very nice work. What is the advantage of moving the linkage mount aft on the HRC version? The only thing I can think of is that it would allow the use of longer dog bones (longer lever) without losing ride height...actually wouldn't that allow for higher rear ride height?

I have a computer program to unlock the reasons behind the HRC linkage... I'll post the out put...

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IIRC, shorter dogbones/linkage = higher ride height. On the 3rd gen I believe that it's a 3:1. e.g the Thurn linkage for my 3rd gen that I have is 11mm shorter than the standard link which equates to a 33mm increase in ride height. I'm very curious to see what your computer spits out.

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