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# The Tuesday Tune 14 - Myth busting

Tuesday Tune 14

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Mid support is driving me mental. Does the rear shock setup and frame design affect brake dive? If I apply either brake, the front drops and the bike plows, I've tried maxing out low speed compression, adding more tokens and removing tokens with more pressure in the fork, and I get a harsh ride or a bike that doesn't feel balanced with no hope of getting through all the travel.
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(Please correct me if I am wrong) The TPC+ damping circuit provides a damping stack that provides additional damping when a certain energy of impact is reached (force x distance). Plush at the top, yet increase in damping later in the stroke.
Whats your thoughts on the tpc+ circuit (be nice because I'm a big fan of it).
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Love these videos super helpful. I know this video is old, but I'm confused when you say the spring rate is not affected by the material (titanium vs steel). The equation found here for calculating spring rates is material dependent based on the shear modulus. I know the shear modulus is calculated based on elastic modulus and Poisson's ratios and we could get way into talking the numbers on how these are calculated, but everything I have seen online indicates spring rate is material dependent.

Do you mean to say that the differences between steel and titanium would be imperceivable by a rider because they are so small? I'm assuming you have tested these. Don't mean to be nit-picky, I'm just a geologist who has done some high pressure compression research where strain vs sheer rates (shear modulus) are very applicable.

Equation: thompsoncs.iapplicants.com/ViewJob-762689.html?jb=3&source=42201
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@a-prince: if you made the spring the same physical geometry then yeah you'd get wildly different spring rates from steel and titanium, but they don't use the same pitch or wire thickness or anything. Spring rate by definition is unit force per unit distance. Regardless of what creates that number, if the number is the same, the rate is the same. The strain rate dependence (hysteresis) within the elastic regions of steel and titanium is absolutely negligible.
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@VorsprungSuspension: ahhhhh ok totally makes sense. I had assumed the physical dimensions were the same.