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I'm interested in upgrading my bike. I want to go with a Diamondback Insight. However their website doesn't say 21 speed. Specs say: Shifter is Shimano EF-51 Easyfire 7spd. Gear is Shimano 7spd Freewheel (14-28t). I just want to see 21 speed. Schwinn lists the speeds of their bikes. Actually many of the Diamondback bikes do not list the speeds. Help on this is appreciated.
 

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Its a 21 speed. Here is what you want to look for. 7 speed means the rear cog has 7 sprockets. When you look at the specs of the bike look for this.
Code:
CRANKS. Shimano FCM131 w/ chainguard, 28/38/48t
The three numbers mean how many chain rings are on the cranks. Thus called a triple. 7X3 = 21. So the bike is a 21 speed.
 
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