i have one friend using mongoose (the red bike),
as for now, he just change the saddle.
for the price, i think it's not bad
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i used to own mongoose before.
bought for rm780 at that time (that is 2 or 3 years ago) and now the price as low as rm700 and above with good built quality.you will find a bit different on the handle post compare to other.it use riser type of handlebar,screw type of stem-not quick release like other, BUT that is not a big problem for me lah!
the main point i dislike about mongoose package is the wheelset and crank
the wheelset is 451 with 34spoke if im not mistaken (hard to find replacement hub without changing the wheelset) and it used freewheel hub.means u will stuck at 8speed freewheel cogs.cranks also if im not mistaken 46t max with triple plate chainring.its useless to use the smallest one since you on 20" bike.i think those crank are for mtb setup

most folding bike will equip with roadbike size crank (48t and above).
you need extra cost to mod it and the cost to mod these 2 things nearly the same price you bought your mongoose folding bike.oh ya, got another model name naxxus identical to mongoose.its the same,just rebranding.if u just buy for easy leisure ride,its ok lah.but if u are planning to upgrade the gearset system, please keep in mind that the cost will be double

and this is my mongoose,heavily moded
i would strongly suggest you go for trinx ka2016 or ka2016d (d is for diskbrake version with 406 wheelset,non-d is a vbrek with 451 wheelset) over the mongoose since here in Ipoh the price for trinx starting from rm850-950.i heard in KL trinx model priced as low as rm1.1k

well thanks for your reply. i've tried riding mongoose and it's quite good!