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Old 01-02-10, 01:42 PM   #1
mx_599
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Air Suspension, when it fails...

wondering if you guys could help me out. never really had a blown seal and loss of pressure. mostly coil suspension in the past.

are the bikes rideable, or not without causing major damage?

i am referring to both front and rear.

i ask because i have 5-7 50-100+ mile events planned coming up and just trying to plan for dnf prevention. a lot of money, prep, and sacrifice can go into these to be done for due to mechanical problems.

depending on what people have to say, i have a couple follow-up comments/questions.

thanks

mx
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Old 01-02-10, 03:14 PM   #2
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I've had my fork lose it's air pressure a few times. Yes, I continued my ride. No, it wasn't pretty. Yes, I did get hurt. The next time it happened I walked my bike outta the woods. Total lack of control. I've never lost a rear shock on a ride so no help there. Your smart for thinking of this in advance but I can't think of way to fix something like this on the trail. I'm talking about a total loss of air pressure not a leak/small leak situation. You should run your double coil sprung Ibis???
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Old 01-02-10, 04:08 PM   #3
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thanks for reply. mojo is possibility, but i really wanted a dedicated 4" FS xc race bike. i am thinking yeti asr or SC blur. not sure yet.

i was blinded by the fact that i wanted a CCDB so bad when building my mojo that i did not realize that the linearity of a spring is not meant for the ramp down of the swing arm travel on the mojo. one of the guys at ibis told me this. i had no freaking idea. i did not look into it that much and i do not know why the guys at ibis didn't say something to me prior to the build when i was asking them about the CCDB. i found this out over a year later! i guess the ramp up of the air shock meshes with the ramp down of the dw link. with a coil, you simply get the ramp down so the suspension loses bottoming resistance at the end of travel

who knew? i didn't...

the mojo is on hiatus now. i sold the brown medium frame and i am buying the white frame in small. i am considering ebaying the CCDB and fox and buying ultra light dt swiss fork and shock. i will drop a lot of weight and maybe my mojo will ride even better with air in the rear. it was my first FS bike so i thought it was great with the CCDB ??

so i figure maybe have a 23 lb do all mojo with 5" and a dedicated 20 lb race bike with 4" travel. (i guess i kind of give up on coil unless i build a DH bike...i should have listened to everyone a long time ago)

back to the topic of thread:

i figure the main reasons for a catastrophic dnf at a long race would be one of the following. catastrophic as in you are definitely not finishing and SOL...not so much as danger catastrophic.

1) tire issues, mostly flats
2) chain issue
3) crank issue, lose a bolt
4) air suspension blown

i want to travel light so i don't want to take too much stuff. here are my plans:

1) spare tube, stans, patch kit, CO2, back up pump. i dont think i want a spare tire and just hope for no major side wall failures

2) maybe a chain tool and couple quick links. would any of you actually try to take a spare chain??

3) less of a concern to me. i would make sure things are mildly loctited if appropriate and mechanically sound before hand (happened once on an older style crank of mine yrs ago, i don't think it as much an issue these days and i think it was partially my fault...)

4) .....


i would like to hear more from people that had fork or shock failures? did you have to walk it out??

i wonder why some company does not make a temporary elastomer device that would offer enough travel to prevent damage to frame but make the bike almost rigid in the back. a device that was like a telescopic elastomer that was the same length as shock that you could carry in camelback and put in place as a last resort...

and maybe a plastic like device that could clip on the fork somewhere to temporarily make it rigid.

any thoughts?


i do not typically have mechanicals...but if i am going to do leadville, i want to finish it as well.
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Old 01-03-10, 04:15 PM   #4
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I can't offer any advice, but if you do Leadville, best of luck.
I'd ask for vids, but don't want to burden you lol.
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Old 01-03-10, 04:34 PM   #5
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I have had a coulpe of air shocks (5th air,Fox) and I have had great luck out of them. Hambone had one blow and it was unrideable,but that was once over a several year period. Good luck with your project.
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Old 01-03-10, 04:37 PM   #6
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I have had a coulpe of air shocks (5th air,Fox) and I have had great luck out of them. Hambone had one blow and it was unrideable,but that was once over a several year period. Good luck with your project.
so i guess it does sound pretty rare. i probably just will not worry about it then.

thanks for your input.
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Old 01-03-10, 04:40 PM   #7
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They seem to be pretty reliable.Post pics when you get it built!
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Old 01-03-10, 04:49 PM   #8
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They seem to be pretty reliable.Post pics when you get it built!
yes i will.

it will be a couple months though. the first race i want to do is in march so it will come pretty fast.

seems to be a toss up between -- yeti asr carbon, SC blur xc carbon, top fuel 9.8, or possibly GF superfly 100. but i am not sure the 29er is best for me...

i need to find out if i can buy a top fuel frame only rather than complete bike.
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Old 01-03-10, 05:18 PM   #9
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U could always borrow a 21 lb HT from an old friend till u got yo stuff going. 'm juss sayin............
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Old 01-03-10, 05:21 PM   #10
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U could always borrow a 21 lb HT from an old friend till u got yo stuff going. 'm juss sayin............
nothing happening soon, like 2 ft snow outside

hey, arent you in tennessee?

two of the races i want to do are in tennessee. a 12 hr and 100 miler. in may i believe, one might be in april. i think they are both on east side of state. i will probably register soon for them.
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Old 01-03-10, 05:38 PM   #11
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Where at in Tenn?????
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Old 01-03-10, 05:40 PM   #12
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Where at in Tenn?????
http://www.newleafadventures.com/cohuttacourse100.html

http://www.dirtsweatandgears.com/

i believe both in the east...maybe south east near mtns

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Old 01-03-10, 05:55 PM   #13
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When the positive air chamber fails on an air sprung fork or shock, they will tend to bottom out and stay there. I don't know how many people would consider a bike in that condition rideable. Most failures seem to be caused by lack of maintenance. As long as you monitor the amount of oil in the air chambers, they tend to be pretty reliable.
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Old 01-03-10, 06:37 PM   #14
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1) spare tube, stans, patch kit, CO2, back up pump. i dont think i want a spare tire and just hope for no major side wall failures
I usually put a spare tire in one of my drop bags, just in case. I figure if I get a big cut, I can boot it and switch at the aid stations. Most 100 milers have multiple bag drops and usually bring one bag to 2 different stations (or one aid station acts as 2)

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2) maybe a chain tool and couple quick links. would any of you actually try to take a spare chain??
I usually carry 2 quick links and a 4 inch section of chain. You could throw a full chain in a drop bag just in case.
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3) less of a concern to me. i would make sure things are mildly loctited if appropriate and mechanically sound before hand (happened once on an older style crank of mine yrs ago, i don't think it as much an issue these days and i think it was partially my fault...)
definately

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4) .....
spare cleat or cleats, cleat bolts (carry). extra tubes and co2 in each drop bag.

spare brake pads if it is muddy or rainy at all. zip ties. duct tape.

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i would like to hear more from people that had fork or shock failures? did you have to walk it out??
never seen it but I am sure some company makes what you are after. good luck
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Old 01-03-10, 07:04 PM   #15
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some good points! like cleats

...and i forgot about drop bags. i would definitely take some extras for the bag

thanks a bunch

honesty, i need to sign up for one of these because i am getting fat and bummed. if i sign up for one, it will give me something to work towards...including eating better in these winter months
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Old 01-04-10, 11:45 AM   #16
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I just remembered – I had a 2005 Specialized Enduro with a 5th element air shock that failed on a ride. I had about 15 miles to ride home. It was lame but was able to ride out.

A couple of years ago I was on a 50 mile back country loop when I tore my RD off at mile 31. I did the trailside SS conversion, made it another mile before the tension of the chain overpowered the chain ring bolts – broke all 4. Had a 18 mile run out - rough day. Now I have a few chainring bolts in my back country pack.

For endurance events – 24 hour, and the CCP100 (I’ve done 3x now) I bring all the extra tools – I just leave them in my drop bags, and collect them after the race. The biggest key is preparation, make sure you maintain properly – and don’t make any changes to your equipment <2 weeks before the event.
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Old 01-04-10, 12:03 PM   #17
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I just remembered – I had a 2005 Specialized Enduro with a 5th element air shock that failed on a ride. I had about 15 miles to ride home. It was lame but was able to ride out.

A couple of years ago I was on a 50 mile back country loop when I tore my RD off at mile 31. I did the trailside SS conversion, made it another mile before the tension of the chain overpowered the chain ring bolts – broke all 4. Had a 18 mile run out - rough day. Now I have a few chainring bolts in my back country pack.

For endurance events – 24 hour, and the CCP100 (I’ve done 3x now) I bring all the extra tools – I just leave them in my drop bags, and collect them after the race. The biggest key is preparation, make sure you maintain properly – and don’t make any changes to your equipment <2 weeks before the event.
thanks for advice!
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