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shredteds rossbellphoto's article
Jun 7, 2018 at 11:17
Jun 7, 2018
shredteds pinkbikeaudience's article
May 29, 2018 at 13:41
May 29, 2018
Ask Pinkbike: Riding At High Altitude, Geeking Out On Race Results, and Replacing Rotors
That's kind of a half-truth. The air in a airspring will heat rapidly when compressed, but will then cool rapidly as it re-extends. The main factor for the heating of an airspring is the heating from friction around the airspring piston, which I imagine is a very minor effect given how well lubricated they are.
shredteds mikekazimer's article
May 26, 2018 at 9:49
May 26, 2018
Review: MRP Ribbon Coil Fork
@loganflores: I'm not sure what you're saying here. No part of the piston is exposed to air pressure, it is fully encapsulated. A change in ambient air pressure will not affect a closed airspring like we have on mountain bikes. Here's an example of a system which would be affected by ambient air pressure: Imagine you have a cup and a piston that seals perfectly inside that cup. Let's say you put the piston into the cup at high altitude (maybe 10psi ambient). If you bring that cup down to sea level, the piston will travel down the cup, compressing the air inside until the pressure on the inside of the cup is equal to the ambient air pressure. This is only because the piston is exposed to ambient air pressure.
shredteds mikekazimer's article
May 25, 2018 at 13:35
May 25, 2018
Review: MRP Ribbon Coil Fork
@loganflores: Haha, no worries! Just because it's an aluminum tube being subjected to differences of only a few psi - virtually no deflection whatsoever.
shredteds mikekazimer's article
May 25, 2018 at 10:33
May 25, 2018
Review: MRP Ribbon Coil Fork
@loganflores: Yep. Want me to do the math and show you how it works? I have a degree in exactly this field, not that you need one for a highschool level physics problem. Here's the story in brief... State 1 at sea level, State 2 at high altitude. PV=nRT Since no gas is added to the airspring: n1=n2 Since the body of the airspring is (practically) rigid: delta(V)=0 V1=V2 R is constant for a single gas, T is unchanged: Therefore: P1=P2 Sorry.
shredteds mikekazimer's article
May 23, 2018 at 20:54
May 23, 2018
Review: MRP Ribbon Coil Fork
@allballz: If you're an engineer and you think a totally enclosed airspring at the same temperature will change characteristics simply by going up in altitude - remind me not to drive on your bridges or drive in your cars. It seems like you might need to revisit your basic thermo. I'm going to guess you're probably not actually an engineer (or at least not a degreed/licensed one). Especially given that you copied and pasted your comment from one on MTBR. Unfortunately, you picked the wrong one to paste :/
shredteds mikekazimer's article
May 23, 2018 at 15:09
May 23, 2018
Review: MRP Ribbon Coil Fork
I believe the 27.5 fork will go up to 180mm.
shredteds mikekazimer's article
May 23, 2018 at 8:53
May 23, 2018
Review: MRP Ribbon Coil Fork
@allballz: Since the body outside the air spring is rigid and the piston is not acted on by the outside air pressure, the pressure within the airspring only changes with changing temperature. You could send the airspring into outer space and the force required to push the airspring through its travel would be the same. What you're describing is what would happen if one side of the piston was exposed to ambient air, but this is not the case in an enclosed airspring. Trust. @sailor0231 if you took the absolute pressure of the airspring at any altitude and then moved it to any other altitude, the absolute pressure would not change and the force to move the airspring would be the same.
shredteds mikekazimer's article
May 22, 2018 at 14:03
May 22, 2018
Review: MRP Ribbon Coil Fork
@jselwyn: Really? How does it only affect the last 1/3rd? From where I'm sitting it's all about shaft speed, but is amplified by end stroke, because change in volume percentage per fork movement is greater near bottom out. Am I missing something?
shredteds mikekazimer's article
May 22, 2018 at 14:01
May 22, 2018
Review: MRP Ribbon Coil Fork
@Rabbuit: Just FYI, I come in at a hefty 170lbs in gear and am running the medium spring at 160mm. I can (and have) bottomed it a fair few times, but have started running 4/6 compression and that has dialed the fork in super well.
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