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On test: Blackburn Mammoth 2Stage pump, December 13, 2008
Big and brawny... but with brains to match
Looking for monster-sized inflating power and minimal bulk but don’t want to bother with CO2 cartridges? Blackburn’s new Mammoth 2Stage mini-pump might be the answer, says Cyclingnews' technical editor James Huang.
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Blackburn’s latest Mammoth 2Stage mini-pump is really two pumps in one: one with high volume/low pressure and the other with low volume/high pressure, both of which are easily accessed via a handy switch on one end. The idea here is to get the bulk of the air in while both the internal pressure and pumping effort is low, then switch to the high-pressure chamber to top things off without needing the strength of twelve men.
Indeed, a reasonably quick 120 strokes (40 high volume plus 80 high pressure) yields a usable 28psi in a true-sized 26x2.0" tyre with just moderate effort. Stronger-armed users will definitely be able to get things up to the same pressure with fewer strokes or, conversely, those looking for an easier time can switch to the other mode earlier on. Either way, a locking convertible Presta/Schrader head minimises air losses.
Like Blackburn’s other latest-generation mini-pumps though, the Mammoth 2Stage uses an inverted design that leaves little room to support the head during inflation. Users therefore need to exercise a little more care - or modify their existing technique - to prevent bending or breaking a valve stem. We also miss the standard Mammoth’s handy pistol grip handle.
Though nearly as quick as a full-length pump and obviously much shorter, the Mammoth 2Stage still pays for its extra power in terms of girth and weight. The fairly short 23.5cm length is paired with over 3cm in diameter and a substantial 175g, not including the included 22g cage mount.
Even so, it’s hard to fault the quality aluminum - rather than plastic - construction that can clearly take a beating and it all still fits in most hydration packs. Add in Blackburn’s superb warranty and the Mammoth 2Stage is one of the best options out there for the fat tyre crowd as long as you don’t mind having to carry it around.
Price: US$29.99
Weight: 175g (pump only); 22g (mounting bracket)
Pros: Two-stage design delivers fast volume and adequate pressure with only
moderate effort, quality construction, locking head, reasonable cost
Cons:Somewhat heavy, inverted design leaves little space to support head
during pumping
Cyclingnews rating: 
More information: www.blackburndesign.com
Photography
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Images by James Huang/Cyclingnews.com
- The Blackburn Mammoth 2Stage mini-pump packs a lot of power in a relatively small package.
- Two chambers offer either high volume or high pressure
- A locking head minimises pressure losses during pumping.
