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Old 05-13-19, 06:26 AM
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It can be done but will be expensive as you need to replace the full drive train. 7 speed is wider so new rear wheel or hub, 6/7 speed index derailleur, 6/7 speed index free wheel and 6/7 speed shifter. I changed 2 Dahon Board Walk bikes like this from 6 to 7 and it ended up costing about $50+ per bike. In my case the replacement was from 6 to 7 and the reason was the 6 speed stuff was worn out and very hard to find. The 7 speed parts were actually cheaper. Roger

Last edited by rhenning; 05-13-19 at 06:40 AM.
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