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bontrager flash charger pump

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bontrager flash charger pump

Old 02-12-15, 03:06 PM
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ColinL
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bontrager flash charger pump

I bought a Bontrager Flash Charger pump today and have a new tubeless setup to try it with. I'm going to be very disappointed if this thing isn't the second coming of .. ah, easy tubeless installs, considering everyone raves about it.

Setup:
Spank Oozy Evo26 wheels - got them for $340 on clearance from Jenson
Stans 25mm yellow tape
Stans 35mm tubeless valves
Front tire - WTB Vigilante TCS Fast/Light 26x2.3
Rear tire - Maxxis Minion DHR2 EXO TR 26x2.3

I'll use this wheel & tire combo for rocky trails locally and lift service DH this summer in Colorado. I usually run what I'd consider 'aggressive XC' tires because most of the trails are in fact XC, just hardpack and roots. On my last trip to CO, I realized that I was way under-tired.


Anyway, about the pump. I'm curious how many strokes it will take to prime that massive air chamber.
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Old 02-13-15, 09:05 AM
  #2  
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The pump is simple to operate. Flip a big red lever down and it builds air in the chamber, and nothing comes out of the hose. It takes maybe 50 strokes to get the air chamber to the top of the 'charge' line. After it's there, you attach the pump to the valve (if not already attached) and then pull the red lever up. WOOOSH. It fully beaded both tires the first try, without soaping the sidewalls and left both tires around 45 psi. These are high-volume 26x2.3 tires. I would guess it would be less pressure for a huge 29er tire since they have more volume.

Since you're filling the chamber and the tire, it takes more strokes than a normal pump, but the lever effort is easy, even when you're up in the 'CHARGE' range. (It's WAY easier than pumping an inflatable standup paddleboard to 15psi-- normal adults can do this with ease. Kids, maybe not.) Below charge the dial lists a max of 160 psi, meaning you could use this for road bike tires as well, including tubeless road. I can't begin to estimate what pressure may be left in a cyclocross or road tubeless tire after the initial charge. They're much lower volume than my MTB tire, but also use a lot higher pressure.

My full process was 40 minutes for both tires.
1. install stans tape
2. install valves
3. mount tires with 20% of one bead free
4. pour in slime pro sealant
5. mount the last 20% of the bead
6. charge pump - about 50 strokes as I mentioned above
7. attach pump
8. pull lever. WOOSH. 45 psi, tubeless
9. swish sealant around in the tire
10. observe any air leaks and be sure sealant is plugging them
11. re-inflate tire to max listed on sidewall and let them sit overnight

The DHR2 sealed perfectly. The Vigilante had 3 weepy spots in the sidewall .. kind of annoying for a new tire. I haven't seen that since using a set of Specialized Ground Control a few years ago. The sealant took care of them with no problems, though. EDIT: the WTB Vigilante is the light/fast model so it does have thin sidewalls, and the Maxxis DHR2 is EXO TR, so it has beefy tubeless sidewalls and weighs 100g more than the WTB, but it isn't a 2-ply DH casing.


In summary, the pump works awesome, excluding the universal head. Every time I attach the universal head, it depresses the presta valve and starts deflating the tire a bit before I can flip the lever to lock it on. Minor annoyance, and common to most universal heads. It's worth $120. Sweet talk your Trek dealer for a slight discount.. it worked for me.

Last edited by ColinL; 02-13-15 at 09:12 AM.
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Old 02-15-15, 08:00 AM
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osco53
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Been looking at that pump, Good Review, but I got a compressor, I'm ok for now..
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