seat tube

pantera06

how do you find out the diameter of a seat tube beacause i am building a bike but dunno what seat tube size it is i have got a seat tube collar for it

ratty2k

Vernier, bore guages, internal micrometer....

nicklouse

or look at the front mech band. as if it uses a and on mech it will be one of 3 standard sizes for the band and if the tube is the same top and bottom.

pantera06

i aint fitting a front mech cos its single speed i need to know cos need a seat post thanks

supersonic

What frame?

nicklouse

ok then what is the bike as you seem unable to measure it.

pantera06

sarazen blitz

pantera06

does ayone know the size or know how to find out the size of a seat tube the bike is a sarazen blitz

Spider987

Measure the hole where the seatpost goes

pantera06

how do you measure it tho cos i need a seat post cos i am building it

xtreem

With a ruler, for a rough measurement but I think it will do the job.
Or for more precise you should use something like this:
[sorry about posting picture because I don't know the english name of this tool] :oops:
Is it Vernier Caliper?

nicklouse

as the saracen blitz is a frame that can have a front mech the tube Out side diameter can be one of only three sizes. the same sizes as the front mechs come in.

ride_whenever

if you pop into your lbs they should have some to measure it with.

pantera06

so is it the size across or is in the diameter the size of the circle

justresting

the measurement around a circle is the circumference