QUOTE(etigge @ Feb 12 2017, 08:48 PM)
Just for info purposes, here's another article.
For those using 7 speed gearset, there's not much improvements can be made without spending more than the bike itself. As you know most with 7 speed gears are entry level bikes, the price was low because of the obsolete components. The difference is usually the hubs which can only use freewheel cogs, where the freewheel ( the movement of the cogs which engaged one way but free when turn the other way, so your foot can stay on the pedals when you stop pedaling instead of following the turns like a fixie ). Freewheel cogs have the freewheel mechanism on the cog cluster itself where else the common one nowadays have freewheel hubs, where the freewheel mechanism is on the hubs and the cog cluster are on their own called a cassette in this case.
So, for the 7 speed ones, here's another option to add more oommph! Can't seem to tackle the slope, here's a picture of the freewheel cog that is brought in by a LBS in Teluk Intan. It's a 13T to 34T cluster, 8 speed. That's one click more for low gear and 2 clicks more for high gear. Usual 7 speed is 14T to 28T only. I have seen 11T to 30T clusters before made by Epogue but they are quite costly.
This is the cheapest option actually, just buy this and screw onto the wheel set ( no need to change ) and then get an 8 speed shifter. As for rear derailleur, I am sure it can handle another higher gear, most lower levels are long cage anyway. You can hunt for an 8 speed right hand side shifter easily in BBS (usually those twist shifters) or buying a pair of new trigger shifters is about 80 bucks anyway, plus another 110 bucks, you can get 3 extra gears onto your 7 speed.
http://bicyclebuysell.com/item/300708/sunr...el-free-pos-w-m

sorry to quote old post. i would like to thanks
etigge for sharing the information.
i bought the DNP 11-28T to replace the 14-28T 7-speed freewheel on my 16" foldie.
for anyone who interested, i have seen this been selling on shopee which cost RM89.10
https://shopee.com.my/DNP-11T-freewheel-7-2...9491.1293245502but i decided to get from taobao because i need to buy the extended freewheel removal tool as well.
the bearing of DNP freewheel is deeper than the original MF-TZ21 freewheel, so need longer tool.

freewheel + removal tools + china shipping = RM57.24
china to malaysia shipping = RM16.20
still cheaper than shopee.
This post has been edited by BOTAK_WAI: Mar 3 2019, 07:08 PM