there are not that fast lah... pace around 30kmph i can follow, after that jalan dulu i will arrived late lor

there is no podium to chase
hahaha..thats the point..
i am no sifu lah. mostly i google all the fact and paste it here. i only know some good keyword to google it better
1stly,
u need to know some basic knowledge about tern/dahon/fnhon.
mostly those 3 brands used a bit wierd type of wheelset. not like an alien thing, but comparing other than this brand, the front hub diameter is 74mm for rimbrake. where else, normal hub one is 100mm same like roadbike, mtb. rear hub mostly same all brand, commonly used 130mm for rimbrake and 135mm for disc brake. rear can kawtim, 5mm easy to adjust. problem will occur with 74mm. there is adapter to convert 74mm to 100mm. matters with dahon/tern/fnhon, their front fork is 74mm, and cant fit 100mm hub. u can "kangkang" the fork with special tools, but not all shop willing to do that.
2ndly
ur link c7 wheelset is freewheel and not freehub. means need to change to freehub wheelset to accomodate casette 8-11speed. so either u change only the hub or buying the new wheelset will solve the problem. i know there is option special freewheel cogs until 9s, but finding it very hard also.. so ditch the idea and stick to freehub as its easy to get parts.
3rdly,
number of T means how many tooth do you have. mostly 5 bolts crank in rb world came with either 130bcd or 110bcd. there is 144bcd, but commonly used by track bike/kirin/velodrom/fixie. dont fint bcd 144, also hard to find replacement chainring. if ur tern c7 got bolt to change the chainring that its easy.
ok, to get it clear, 110bcd got 2 type of crank. that is 4 bolt system and 5 bolt system.as for summary i listed below
- 5 bolt system 110bcd : available chainring 34t, 36t, 38t,50t, 52t
- 5 bolt system 130bdc : available chainring 39t, 42t, 44t, 46t, 52t, 53t, 54t, 55t, 56t, 568t, 60t, 62t
- 4 bolt system 110bcd : available chainring 34t, 36t, 38t,39t, 50t, 52t, 53t
please note that 110bcd 52t, is not the same like 130bcd 52t even though both same teeth with 5 bolt system.
there is some weird design of bcd chanring. i had expirience once with deca crankset and fys crankset. both bcd 130 but both chainring cant swapand last but not least, u will get better spec if u buy separately upgrade parts than buying new bike and swap component. this is because some oem part (original equip with the bike) are not that good. why not try to scout for used part for better saving?
feel dizzy??

digest it slowly ya bro

Thanks for the advise! I forgot about the tern/dahon front wheel hub diameter is 74mm... sifu etigge mentioned it to me before
The tern C7 crank comes without any bolts, how to check if it is 110 or 130 bcd