The best way is to change the front sprocket if you can, as this usually means you don't need to change the chain for one of a different length. If you want to gear the bike lower, replace the front sprocket with one that is 1 tooth smaller. This usually gives a 6-10% reduction in gearing. Two teeth would of course give you twice as much reduction. One tooth on the front sprocket is usually about the same as three teeth on the back sprocket. Bare in mind that putting a smaller sprocket on the front will make the load on the teeth higher (less teeth to carry the same drive power) by about the same amount. If the chain and rear sprocket are worn, then you really should replace them all. If you don't, the new sprocket will wear very quickly to match the chain.
Regards
Nigel in NZ
--"How can I be lost if I don't care where I am?"--
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The mouth of a perfectly contented man is filled with . -- 2200 BC Egyptian inscription
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