Sprockets is the Monkey Engineer's path 2 tier 3 upgrade in Bloons Monkey City. It slightly increases the Engineer's nail gun attack speed. In the Flash version, it spawns "SentrySprockets" instead of ordinary sentries that have an increased fire rate, but these sentries are not affected by any sentry-related Monkey Knowledge except the level 3 effect that grants them Camo detection. In the mobile version, this upgrade does not affect sentries at all due to an error.
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Costs and sell values
Note: this list does not factor in Monkey Knowledge or other discounts.
Tiers
Mobile version
Flash version
Cost
Sell value
Cost
Sell value
0-3
$2,100
$1,680
$2,350
$1,880
1-3
$2,600
$2,080
$2,800
$2,240
2-3
$3,000
$2,400
$3,150
$2,520
Strategy
Sprockets is not strong for its cost compared to multiple 1-0 or 2-0 Engineers, due to the high cost of its preceding upgrades for not much extra attack speed, as well as Larger Service Area being a detriment to sentry consistency. In the Mobile version, it's terrible, merely providing a slight nailgun boost.
7,500 (Multiplatform version)
7,500 
20 (Flash version)
300
