Bash Guards??

Can someone explain bash guards to me?
Do they replace the outermost cog on the front gears (is this known as the derailleur)?
If so I guess this means the bike wont able to be pedelled as fast as a bike with the front cog present?
Am i correct?
Do they replace the outermost cog on the front gears (is this known as the derailleur)?
If so I guess this means the bike wont able to be pedelled as fast as a bike with the front cog present?
Am i correct?
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Pitch Comp
Check out chain reaction cycles and look at the Blackspire Big ring protector. It's not the cheapest of things really and they only seem to come in a 5-bolt set up - Look on your bike, your pedal arm (crank), where it attaches to the rings is there 4 or 5 bits springing off that bolt into the chain rings. - If 5, there is a products that fits!
Gt I-Drive XCR5
Cannondale CAAD8
Bighit , 5 , BFe