[vikb]

CO2 can might seat a tubeless tire that has come off the rim or rolled the bead.

It's possible, but I've seen lots of people even fail to inflate a tube properly with CO2. It's one and done. With a pump you get to keep trying and if you have a tube you are going to at least be riding down the mountain to where you can get the tire fixed.

 

[J.B. Weld]

Y'all are doomsayers. Think positive.

 

[Jayem]

CO2 can seat a tubeless tire that has come off the rim or rolled the bead.
Mini pumps can rarely seat a tubeless DH tire/heavier casing tire.
For general bike park laps and most mtb rides it's plugs and CO2 for me.
For backountry rides and bikepacking it's a mix of CO2 and a tiny mini pump that doubles as a CO2 inflator.
Mini Lezyne bag works great under a dropper seatpost for 3 CO2 cartridges, plugs, multi tool and a few other key things.

I disagree.

You either have one of two situations,

One, the tire fits tight on the rim/channels. The width of the tire and channels are just perfect so that it makes a "seal" without doing anything. You simply add air, whether it's a shock pump, mini pump or floor pump. I've had plenty of tire/rim combos like this.

Two, the tire is loose, has folding beads that leak air or some similar situation. In this case, you can "blast" it on with an air compressor with the valve core REMOVED, but a pump or even a charger pump (air tank) isn't going to get the tire on with the valve core in there. I've tried enough times. This is more common for me than the "perfect" tubeless tire-rim marriage.

If you really think in situation two that a CO2 will do it, verify you don't have situation one and then try it out, a hell of a lot better than finding it out in the field. Again, a tank of air won't do it in my experience, so a CO2 going through the same tiny valve won't either, unless there was some way to hook it up without the valve core, but then you'd need to fill the tire again after "blowing it on".

I know how to handle situation two and have come up with the universal-so-far cheat, but a CO2 ain't it and I can do it with a minipump. I've demoed this and done it several times on vacations when I bring multiple tires.

CO2 is pressurized air alright, but pressurized air is fairly useless (for seating) IME if it has to go through the valve core.

 

[Helmut Molde]

Y'all are doomsayers. Think positive.

We're all gonna die...

 

[fiveo]

Not to be a jerk but, it’s 2022. Are we really discussing CO2 or mini pump? Ever pump up a tire with a mini pump? Outside from the cost of cartridges, no reason not to go CO2. With that said. If I am on an epic all day backcountry ride. I carry both.

 

[11053]

Different strokes for different spokes...
And, the mini pump as the first option crew seems to be happy with several hundred initial strokes.
A few ways to serve the need, but I'll take a CO2 shot and maybe a few mini pump strokes to finish off the fix vs the non CO2 strokefest any day.

 

[kpdemello]

CO2 provides limited air supply. Mini-pump provides UNLIMITED air supply.

Several hundred strokes are no problem. I'm married, so my forearms have plenty of endurance.

 

[OldMike]

The trick is to use a combo pump (like/similar to the one in post #5) and get the tire to seat/seal with the pump......THEN open up the CO2 to fill.
IMO it's 50/50 whether the tire will seal. Another reason l carry a Tublito S-MTB @ 45g. Everything fits in the SWAT Box.

 

[dirtwolf]

Finally solved this problem - fork corked one of those lezyne pocket drive pumps into my steerer tube with a little scrap of foam to stop it rattling around. Much like my spleen, I don't even know it's there until I need it.

 

[Nat]

Since we're talking about DH riding in Whistler Bike Park you don't need a backpack to carry water since there are water fountains everywhere. Having water weight on your back or hips can throw your balance off a bit while jumping. Dump it. In fact, next season take notice of how few people carry a pack. It's mostly just the people who look like they're new to park riding, isn't it?

Convert to tubeless WITH Cush Core Pro or Tannus Tubeless inserts. If you get a flat your tire can still roll as a run-flat to get you down.

 

[Jayem]

Since we're talking about DH riding in Whistler Bike Park you don't need a backpack to carry water since there are water fountains everywhere. Having water weight on your back or hips can throw your balance off a bit while jumping. Dump it. In fact, next season take notice of how few people carry a pack. It's mostly just the people who look like they're new to park riding, isn't it?

Convert to tubeless WITH Cush Core Pro or Tannus Tubeless inserts. If you get a flat your tire can still roll as a run-flat to get you down.

Everywhere? That definitely wasn't my experience. IME, it was super nice to have a little bit of water for the rides down, like a partially filled hip pack.

 

[Nat]

Everywhere? That definitely wasn't my experience. IME, it was super nice to have a little bit of water for the rides down, like a partially filled hip pack.

Okay, “everywhere” is an exaggeration but they have at least four five drinking fountains on the mountain (that I found): three four at the base of the Fitzsimmons lift line and one at mid-mountain when you get off the Fitzsimmons lift. I took a drink every time through and each run down lasts like what, 15 minutes or so? It was more than adequate hydration for me.

I don’t recall seeing a fountain at the top of the Garbanzo lift. There’s the facilities at the top of the alpine zone where the gondola drops off and they have water if you need it. I’m typically only going up there once or twice in a day though since most of the trails are lower.

 

[fiveo]

This is a little OT, This is a dangerous sport, and it’s getting more dangerous with bigger bikes and bigger features. My point is the trend is to ride with less. Everything on your bike, carry nothing So my question is. What happens when things go wrong? Does anyone carry any first aid gear anymore? Maybe it’s the Eagle Scout paramedic in me, but I always at least have something to control major bleeding with me. Even on my from the garage local rides. It’s saved my bacon more then once. More importantly saved other down riders.

 

[Taroroot]

Since we're talking about DH riding in Whistler Bike Park you don't need a backpack to carry water since there are water fountains everywhere. Having water weight on your back or hips can throw your balance off a bit while jumping. Dump it. In fact, next season take notice of how few people carry a pack. It's mostly just the people who look like they're new to park riding, isn't it?

Convert to tubeless WITH Cush Core Pro or Tannus Tubeless inserts. If you get a flat your tire can still roll as a run-flat to get you down.

SOmebody finally brought this up, if were talking exclusively Whistler park, I'd go through the trouble of tubeless with insert.

 

[J.B. Weld]

So my question is. What happens when things go wrong?

In the context of this thread, worst case scenario, I walk. Never has happened but I accept that risk.


A spare inner tube would make a perfect tourniquet.

 

[Cleared2land]

Nothing ever goes wrong. Why carry anything. If it does, stop someone else to help you. I see folks all the time asking for help because they didn't want to carry excessive weight.

 

[DennisT]

Since we're talking about DH riding in Whistler Bike Park you don't need a backpack to carry water since there are water fountains everywhere. Having water weight on your back or hips can throw your balance off a bit while jumping. Dump it. In fact, next season take notice of how few people carry a pack. It's mostly just the people who look like they're new to park riding, isn't it?

Convert to tubeless WITH Cush Core Pro or Tannus Tubeless inserts. If you get a flat your tire can still roll as a run-flat to get you down.

I actually did that the first couple of weeks (no water, very small hip pack for phone and keys) but I found that my throat dries out partway down sometimes. I don't really use the hip pack to replenish sweat so much as washing down the dust. I still take a drink from the tap in the line-up.

This is a little OT, This is a dangerous sport, and it’s getting more dangerous with bigger bikes and bigger features. My point is the trend is to ride with less. Everything on your bike, carry nothing So my question is. What happens when things go wrong? Does anyone carry any first aid gear anymore? Maybe it’s the Eagle Scout paramedic in me, but I always at least have something to control major bleeding with me. Even on my from the garage local rides. It’s saved my bacon more then once. More importantly saved other down riders.

There's another thread somewhere where people are talking about what they pack on rides (not necessarily DH) and it brings up an interesting (to me) question of what's important and what isn't. I absolutely have to carry my phone, my bike lock keys, and a multitool. Right away, I need at least a fanny pack or something similar. Once I've accepted that requirement, it's only an incremental cost to add other things. Up to a point, of course.

But once you start totting up the things to bring, it can swiftly get out of hand.

• CO2 cartridges and injector
• Tubeless fixing kit
• First aid kit
• mini pump
• kleenex (some of us have allergies, y'all)
• water bladder
• spare batteries for GoPro

...and so on. Honestly, a backpack would make the most sense, especially a USWE that stays put really well. But I hate backpacks (yes, I'm aware of the irony of hating backpacks but not fannypacks).

I know this is getting a bit off-topic, but the whole question of carrying tire-fixing stuff inevitably leads into the question of how to carry them.

 

[DennisT]

Also, quick question: For those who have installed cushcore or similar, any downsides? Does the ride feel significantly different?

 

[SteveF]

Is it weird that I often carry both? The Co2 is fast and convenient, and can hopefully blast a tubeless tire back onto the bead seat if needed. The mini pump can finish filling a tire if your Co2 doesn't get it to where you want it, or if you tire is only a little low, etc, etc. Less painful to lend a pump to someone than a cartridge, too.

 

[baker]

I use this pump/CO2 Inflator. (under 6")

Have you actually used this pump in the field? I ask because it looks tiny and like it would take about 250 strokes to create any meaningful tire pressure. I've been there...

Now I carry a larger pump, usually the OneUp EDC pump, which does double duty.