For other uses, see Sprockets (disambiguation).
Sprockets
Portrait of Sprockets
Increases sentry fire rate appreciably.
Portrait of Sprockets
Adding sprockets to sentries and the nailgun increase their fire rate appreciably.
Tower Path Tier
Monkey Engineer 2 3
Upgrade cost $550
Prerequisites City Level 12
Research cost City Cash 7,500 (Multiplatform version)
City Cash 7,500 Bloonstones 20 (Flash version)
Research time 2 days
XP for researching Experience 300

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 multiplatform version, this upgrade does not affect sentries at all due to an error.

Stats

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Costs and sell values

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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

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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.

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