It appears AIRSHOCKS are lighter then COILSHOCKS.
Currently my concern with AIRSHOCKS is that you might NOT be able to get your airshock HARD enough (IE. It may be too SOFT, even at max pressure, I have reached this conclusion by only sitting on a number of full sus MTB's I was considering buying, but I'll wait a year or 2, until these airshocks are more firmer/harder.)
Also AIRSHOCKS will need more maintenance (IE. Need pumping up often, and air seals may need replacing far before a coil shock needs attention or replacing).
I asked ROCHSHOX, FOX, MARZOCCHI and SR SUNTOUR, and here is the PROFESSIONAL reply from SR SUNTOUR:
All air shocks may leak air over time, but the air seals are generally fairly reliable and you should not need to reinflate the shock on a regular basis. The shock should not leak any air over the duration of a ride unless there is a fault with an air seal or valve. Obviously the internal seals wear over time and will need to be replaced occasionally, but you should get a season’s riding between servicing.
You will need a shock pump to inflate an air sprung shock or fork. These pumps are designed specifically for low volume/high pressure, unlike a tyre pump which is designed for inflating high volume/low pressure. All of the current air shocks on the market will use schraeder type valves and all shock pumps should be compatible.
I see you have a UK email address. If you live in UK the local distributer you should contact is email@example.com
. Most bike shops should be able to answer these types of queries too.
Hope this helps.
SRAM Technical Support
Cape Cycle Systems (PTY) LTD"
Giant Trance x1 ~ 2008