I'm kinda new at bikes. Can you guys help me figure out on what size of headset, fork and seat post I should buy?

This is the measurement of my head post insertion.


This the size of my seat post insertion.

Your measuring tool is insufficient to the task. Go to Home Depot, Lowes, Tru-Value etc and get a caliper. e.g. General Tools Fraction Plus 6 in. 3-Mode Digital Caliper-147 at The Home Depot

Also Amazon etc.

Also many bike shops and even some co-ops have a measuring tool (essentially a stepped cylinder) that just drops in to tell you the correct diameter.

Are you sure you want to sink money into that rusty frame????

Hey guys thanks for the time but sad to say we don't have that kind of equipments here in our province in the Philippines. We don't have bike shops here and we are only relying on online shops.

My project is a classic fixed gear bike. Bought this bike from a junk shop. No dents just a little bit rusty. Hehe

good luck trying to get a seatpost in or out of that rusty seat tube, show us more pictures with make/model and serial number and many here may be able to help. and please clean it up before adding parts...

You bought it? I've seen better on the curb (it appears that you don't have the fork either?). Not worth anything.

In addition to not having the measuring tools needed (someone must have a set of calipers they could use just to check for you) you have chosen one of the most difficult things to do on the bike in wanting to install a new headset and fork. The headset must fit securely in the frame - that will be difficult with the amount of rust present. The headset must be chosen to fit both the diameter of the head tube AND must be compatible with the fork's threading and the headset seat diameter on the bottom of the fork column. The fork must be the correct length for the frame plus the headset height, and you need to have a stem that fits the inside diameter of the fork. Finally, the length of the fork blades and the "rake" need to be compatible with the frame and wheel size.

The fork, headset, and seat post alone would cost more than an operating used bike. You need to start over, preferably with a working bicycle or at minimum with a frame, fork and headset. If you were determined to go ahead and perhaps source used parts you are back to needing calipers and a lot more knowledge than you have.

Vernier calipers are a basic engineering tool, find it hard to believe that you can't source these from somewhere, a tool shop should be able to supply them, as well as hex wrenches and other basic non-bike specific tools.

For the frame in question, got to go with #demoncyclist , it look like a wreck, not worth putting any money into.

You'll need measuring tools with precision of at least 0.1mm; these are available on line if you are unable to source them locally. But surely a city like Manila ought to have a supplier of machine tools?