Best to save your money and then do the whole upgrade in one go.  Why? all the compatible components are installed at once and the whole thing is then tuned to operate smoothly. 

I don't think the Tiagra 10 speed shifter will work with the Neos 9 speed RD.  Tiagra 10 speed RD short cage will not work with your current cassette.

Enjoy the ride on any bikes that you own. Leave the upgrading as secondary as the process will never end.

I can understand the reason for upgrading in stages as I did the same. It is easier to actually get a high spec bike slowly as what I wanted will cost 6k if I choose a Dahon with the specs.
Sadly, you can't upgrade the way you mentioned as Tiagra 10 speed shifters are not compatible with a 9 speed RD. If you want you have to get the whole front modded and then the whole rear modded at once.
So I can suggest going for 9 speed.

That way. You first buy a 9 speed shifter, bear in mind, SRAM and Shimano are not compatible. Also road bikes and mtb has different shifting index length. If you choose Tiagra or 760 shifters, these are road bike flat bar shifters so mtb RDS are not suitable. But if you choose mtb shifters, you can use road bike RDs as long as your cassette don't exceed 30 teeth as roadie RDs has short cage.

So start with say 9 speed Alivio or Accera shifter. That way you can still use the Neos RD and then later change the RD.  Then later add a chain ring to the front. This way if you ride hilly area, just shift the chain manually by hand to the smaller chain ring. Then later the FD and adapter and finally you have 18 speed which is sufficient for Fraser's Hill if you are on mtb set up at the rear. The front is always roadie 53/39 set up.

Wow, these bicycle upgrading can be complicated, at least for me.

I've only been looking at road bike set up as I thought mtb set up would not be suitable for foldie since the RD cage is longer, and also the general gear ratios are higher, won't be suitable for small wheels.

If I would to go with Alivio or Acera shifter, what are the options for RD later?

Also what I've learned from previous post is shifters comes in pairs. With Alivio and Accera, what are the options for FD later?

How about Sora shifters? How is it compared to Alivio and Acera?


And Sora RD? Seems to be able to take my current 32T cassette.

The reason why I like to do it in stages is more to because I want to upgrade it myself. I am kind of a DIY person. And since I'm new to upgrading bicycles, upgrading in stages presents less challenges.

Also, to save cost and to maximise the usage of the current components, I plan to change and upgrades in stages according to my needs.

Right now, the Neos shifter really sucks!  I don't know bicycles terms, so I don't know how to describe it. I can only say that comparing to the stock SRAM 7 speed shifter that came with my Dahon Arc D7, the SRAM is sooooooo much better.

So the Tiagra shifter won't work with the Neos RD, and the Tiagra RD SS won't work with the current 9 speed 11T-32T cassette. Got it.    Thank you! 

So if I want Tiagra RD and shifter, I have to change it together with a 10 speed cassette, and the lowest gear is only 30T, right? That's kind of a bummer, since I also need higher gear ratio for my Vigor P9 now.

From the description below, can anybody tell if this is a 406 or a 451 wheelset?

Size: 18 "Shimano cassette 135mm, 20" Shimano cassette 130mm, 20 "Shimano cassette 135mm
Hall: F = 20H / R = 24H
Rim: A-CLASS "EXA" alloy, matte black, single eyelet
Hub: 7075 alloy axle, sealed bearings, matte black
Spoke: stainless steel, black
Race: F = radial / R = L: 2 Cross R: 2 Cross
Weight: <18 "> F = 532g / R = 796g, <20"> F = 622g / R = 860g
OLD: <18 "> (F) 100 × ® 135mm, <20"> (F) 130 × ® 135mm
Spoke length: <18 "> (F) 151 × ® 157 / 160mm, <20"> (F) 175 × ® 182 / 185mm

I might be wrong but I think the rims are from a model of Birdy bikes which uses 18 inch wheels. So, it is neither 406 nor 451. 

Sorry another open question. 20 inch 130mm and 20 inch 135mm is it 406 and 451 wheels respectively?

135 130 refers to the rear hub length la...

Sifu etig will tell more...

The 130mm and 135mm refers to the width of the rear hub. It actually can be fitted regardlessly only if your frame is 130mm you can force open the width and if you have 135mm frame, you can tighten the QR tighter to close the gap.

Guys.. do you ride when it's sunny out? How's all of your riding schedule looks like? Do you drive to your riding spot?

I've tried starting my ride at 9am (100km+), and i think u can just imagine the suffering and time taken... Never again, and it did my skin a considerable damage

I really can't find time out of my schedule, and most of my available timeslot is on noon... or when the sun's coming up. I can find time to ride at night, but I really fell unsafe since there's lesser cars around... (ie.lesser car, more idiots will think they can get away doing stupid things to you)

Hi al sifus here.. i am looking for advice on which folding bike to get...

Juz wan it for doing exercise ..budget around rm1k