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Where did Shimano hurt you? Or are you just that much into Avinox? Afaik you can set up Shimano motors with tools like Stunlocker or Emax without having to visit a dealer. At least that was possible with the e8000 until Shimano introduced some restrictions for unlocking support for higher speeds in the last firmware iterations. But I believe Shimano motors are still not as thouroughly dongled as other motors. Otherwise companies like Emax couldn't operate anymore.

Totally depends on use case. My wife and I use our e-bikes for self shuttling parks in BC. More power is better in this case, it gets you to the top of a boring fire road climb faster. And contrary to my own expectations, a 50 pound e-bike is actually faster descending than my best acoustic enduro bike. This is on tracks/trails with no pedalling below the speed cutoff of the e-bike. Forbidden dreadnought v2 coil/coil at 37 pounds vs. mondraker crafty xr coil/coil at 49.5 pounds. Both are fun. The acoustic bike is easier to move around in the...

Regarding mechanics/causes of the pump-out sensation, it has always seemed to me to most likely be due to a mismatch in the speed at which the fluid can flow back through the hose and fittings when the lever is released, and the "demand" for fluid to take up the expanding space in the M/C as the lever returns to the starting position. In other words, the fluid is moving too slowly, and so the return spring in the lever creates a partial vacuum in the M/C, which causes it to then draw in extra fluid from the reservoir when the...

Pads retract based on piston seal rollback, not on master cylinder volume. It's a common myth, one I believed until I started deep diving into brake bleeds because of persistent issues bleeding brakes. Here's a video explanation: https://youtu.be/mPptmoy0u3s?si=t8CNIRP7x5uGnBrf

Cavitation occurs when a pressure drop causes the local pressure to fall below the vapor pressure of the fluid. In the scenario you described, fluid was being aspirated by retracting a piston, which introduced a pressure drop due to flow restriction. At low actuation speeds, the flow rate was low enough that the vacuum generated could still draw the fluid through the system without issue. However, at higher actuation speeds, the pressure drop became large enough for the local pressure to fall below the fluid’s vapor pressure, releasing dissolved gases into the closed system and introducing bubbles. I’m not sure...

You're addressing two issues at the same time here. Absolutely the inner diameter of the hoses and ports matter in this case, if you create a choke point you can easily end up with inconsistent bite point etc due to the fluid not managing to move fast enough pull the caliper pistons back before they are activated again. However, the the point about the larger caliper pistons moving more oil back through the hose to the master lever is not correct. The amount of oil that moves up and down the hoses is solely dictated by the master cylinder. The...

Speaking to this point: " Downsizing one set of the pistons decreases the amount of fluid trying to return so may not create the same restriction or at least alleviate it some. " I would have to think it has more to do with smaller seals creating less friction. The amount of oil moving back and forth is dictated by the master cylinder, not the size of the caliper pistons (the smaller the pistons, the more distance they move for the same amount of lever travel). Also, if a big piston gets stuck even a little bit, it would affect...

That’s like, your opinion, man.

If someone is going 30mph up a multi use trail blowing past hikers I don’t think hikers are gonna care if the rider has been going 30mph for 10 seconds or 10 minutes