I ordered my RFX with the Marz shock so I wouldn't have to deal with Propedal.
All in all the Marzocchi's a good shock, if you like real active suspension. Great small bump absorbtion. Great big hit ramp up. The shock has adjustable internal floating piston pressure so you can tune ramp up/bottom out.
Also the shock has a big can. I'm sure we can all agree, large cans are good.
This means I run low pressure - about 85% of body weight.
Having no Propedal means this shock bobs a little more when pedaling. But it also means great traction on technical climbs.
The TST really doesn't do much for me - as it doesn't do much to mitigate bob, but affects the middle stroke - so I either run the shock full open or full closed (locked out) for long fire road climbs.
The piggy back has 1/8" clearance at bottom out. It doesn't interfere with the H2O bottle.
I would recomend it as an option to those of you looking for something else.
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