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Iron Butt
Posts: 763
Anderson, IN (48mi NE of downtown Indianapolis) | All air springs leak down over time. That is one disadvantage compared to coil springs. A new air shock should hold pressure for a month or so with average use before any noticable reduction in pressure. It will eventually leak down though.
A mountain bike shock pump is the same as the Victory pump. The air spring concept is exactly the same on both and use a Schrader valve for pressurizing.
Fox does not make their pump. They buy and resell like Victory. So, the same pump can be found on-line for less $$. A variety of pumps can be found on bicycle websites. Each has its own bells and whistles, but all give you the same result. Type "shock pump" into google and the results are endless. Prices range from $20 to infinity.
The gauge on bicycle shock pumps are crap. I suggest using the gauge that came with your vision.
A good pump will not release any air from the shock when removed. The air you hear is coming from the pump not the shock. If you use a separte gauge, air WILL be released from the shock. The gauge that came with your Vision will reduce the pressure approx 4 psi when removed. If you don't want to mess with a separate gauge, replace the crap one on the pump with a better quality unit. Here is what I use http://gaugestore.com/prodinfo.asp?number=31334 |
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Cruiser
Posts: 297
VA | I forgot about this post, but I actually did buy the Fox air pump. It was local and I didn't have to buy the Victory one. I had to have the rear shock replaced though, it was leaking air badly. I filled the shock to 55psi, which is not near the mx it can hold. We did a 1-1/2 hour ride and the pressure dropped to 30psi. That's a big difference. I tested a few more times, just to be sure, and sure enough, it leaked. Just sitting in the garage for 5 days had a 15psi leak.
I had the rear shock replaced (under extended warranty, now kinda glad that I bought it) and seems to hold air fine now. I still make adjustments between when the wife is riding, and when I am solo, but all is much better. |
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Iron Butt
Posts: 763
Anderson, IN (48mi NE of downtown Indianapolis) | Divesharc,
You mentioned that the HD pump did not fit. I helped design the HD fitting that the pump threads on to. The Victory, HD, and Fox shocks all use the same Shrader valve. So, the pumps are interchangable. Some pumps have different length "sleeves" as you called it, but that should make no difference. Is it possible the seal in the HD pump you used was worn? I have never seen a pump that won't fit, so I am just curious. |
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Tourer
Posts: 309
Vineland, NJ United States | good info. What pump should I buy that will accept the screw in gauge you listed? |
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Iron Butt
Posts: 763
Anderson, IN (48mi NE of downtown Indianapolis) | I like this one the best so far.
http://www.hucknroll.com/mountainbike/CUT0009/Cutter-Transition-Sho...
It's simple and easy to use. No bells or whistles. Toss the 300psi gauge and replace with the 100 psi gauge that I provided a link to above. The reason they come with a high pressure gauge is because mountain bike shocks require much higher pressure than the Vision shock. The gauge is also very inaccurate. The gauge I suggest has a true 3/2/3% accuracy. This means it 3% accurate in the first 1/4 of the scale, 2% in the middle half, and 3% in last 1/4.
This pump is sold under many different name brands. Shop around on-line and you might find it for less money elsewhere. There other pumps that work good too for approx $20. Look for the type that use the bottom mount gauge like the web link above. That way it can be easily replaced.
Hope this helps. |
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Victory/Fox air pump
