London Fixed-gear and Single-speed SJS Cycles

kboy · 12th January 2008

Is there any way to measure what size seatpost I need without buying an expensive measure-gauge-thingy?

RPM · 12th January 2008

sheldon's seatpost size database

kam · 12th January 2008

is there any homemade way? my Viner isn't on the database

kboy · 12th January 2008

nice one, cheers

Sheldon must have karma points over his ears by now

RPM · 12th January 2008

not accurately..

you need to be within .2 of a mm

vernier gauge on the original seatpost or take frame to LBS to measure

Max · 12th January 2008

You can lay a decent ruler across the seat tube and try and sight it from the inside of the tube edges but you won't be able to tell a 27.0 from a 27.2

TBH I would buy a cheap Vernier gauge from ebay - I got a secondhand old fashioned Sheffield Chesterman engineers metal one (non digital) for about £5. Once you have one they are so useful for this and that...

fc9k · 12th January 2008

http://www.victorcen.com/UploadFile/...9_17-53-21.jpg

£10 from maplins / ebay / wherever

well worth it, so many sizing standards on bikes are like within 0.5mm of each other :/

kboy · 12th January 2008

yeah maybe not a bad idea to get one of those, they are after all pretty cool

kam · 14th January 2008

ok i found a accurate ish way if you have a seatpost already. Take a large rizla and wrap it around your seatpost and drop a line where the rizla overlaps. that's your circumference. measure that length really accurately and divide that by pie (or 3.142) and you get the diameter. ok so not necessarily mm perfect but i got a circumference of 85.5 mm which translates almost exactly as 27.2mm! Perfect for that campag chorus i have my eye on! mmm...

the-smiling-buddha · 14th January 2008

tynan probably knows a way involving some glue, a shoelace and a ten pence piece, he is kinda handy like that...;)

tynan · 14th January 2008

Get some glue, a shoelace and a ten pence piece.

Glue the ten pence piece onto the end of the shoe lace, lace this up on one of your trainers leaving the ten pence dragging on the floor behind you.

Go into Maplins and pick up a set of digital calipers, go over to the counter and say 'excuse me someone has dropped some cash here' (pointing at the ten pence).

When the cashier comes around to pick up the money kick him in the head and run out of the shop with the calipers.

chris crash · 14th January 2008

best plan ever

Object · 14th January 2008

Quote:

tynan:Get some glue, a shoelace and a ten pence piece.

Glue the ten pence piece onto the end of the shoe lace, lace this up on one of your trainers leaving the ten pence dragging on the floor behind you.

Go into Maplins and pick up a set of digital calipers, go over to the counter and say 'excuse me someone has dropped some cash here' (pointing at the ten pence).

When the cashier comes around to pick up the money kick him in the head and run out of the shop with the calipers.

Brilliant.

scott not scot · 14th January 2008

or just put the ten pence on the floor and still kick him in the head when he comes round to pick it up.....thus saving you looking like you just had the cheapest wedding in history and couldn't afford a car with tin cans tied to the back!

tobyprice · 7th October 2008

Even with some digital calipers whats the best way to get a measurement from the seattube? I'm getting between 26.70 - 26.00 depending on angle.

P!MP · 7th October 2008

Quote:

Originally Posted by tynan

Get some glue, a shoelace and a ten pence piece.

Glue the ten pence piece onto the end of the shoe lace, lace this up on one of your trainers leaving the ten pence dragging on the floor behind you.

Go into Maplins and pick up a set of digital calipers, go over to the counter and say 'excuse me someone has dropped some cash here' (pointing at the ten pence).

When the cashier comes around to pick up the money kick him in the head and run out of the shop with the calipers.

Damn, wish I'd tried that when I bought my calipers!

P!MP · 7th October 2008

Quote:

Originally Posted by tobyprice

Even with some digital calipers whats the best way to get a measurement from the seattube? I'm getting between 26.70 - 26.00 depending on angle.

Try your LBS, mine has this kind of seat tube looking length of steel thats graduated going from thin to think, they slip it in the seat tube and read off the measurement. Simpsons Cycles in Kentish Town if you were wondering.

MessenJah · 7th October 2008

Quote:

Originally Posted by tynan

Get some glue, a shoelace and a ten pence piece.

Glue the ten pence piece onto the end of the shoe lace, lace this up on one of your trainers leaving the ten pence dragging on the floor behind you.

Go into Maplins and pick up a set of digital calipers, go over to the counter and say 'excuse me someone has dropped some cash here' (pointing at the ten pence).

When the cashier comes around to pick up the money kick him in the head and run out of the shop with the calipers.

lol

I'm crying now.

GinaG · 6th August 2009

has anyone got Digital Caliper I could borrow?

thanks!

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12th January 2008	#1
kboy	Is there any way to measure what size seatpost I need without buying an expensive measure-gauge-thingy?
	quote reply

12th January 2008	#7
fc9k	http://www.victorcen.com/UploadFile/...9_17-53-21.jpg £10 from maplins / ebay / wherever well worth it, so many sizing standards on bikes are like within 0.5mm of each other :/
	quote reply

14th January 2008	#9
kam	ok i found a accurate ish way if you have a seatpost already. Take a large rizla and wrap it around your seatpost and drop a line where the rizla overlaps. that's your circumference. measure that length really accurately and divide that by pie (or 3.142) and you get the diameter. ok so not necessarily mm perfect but i got a circumference of 85.5 mm which translates almost exactly as 27.2mm! Perfect for that campag chorus i have my eye on! mmm...
	quote reply

14th January 2008	#10
the-smiling-buddha	tynan probably knows a way involving some glue, a shoelace and a ten pence piece, he is kinda handy like that...;)
	quote reply

14th January 2008	#11
tynan	Get some glue, a shoelace and a ten pence piece. Glue the ten pence piece onto the end of the shoe lace, lace this up on one of your trainers leaving the ten pence dragging on the floor behind you. Go into Maplins and pick up a set of digital calipers, go over to the counter and say 'excuse me someone has dropped some cash here' (pointing at the ten pence). When the cashier comes around to pick up the money kick him in the head and run out of the shop with the calipers.
	quote reply

7th October 2008	#15
tobyprice	Even with some digital calipers whats the best way to get a measurement from the seattube? I'm getting between 26.70 - 26.00 depending on angle.
	quote reply

6th August 2009	#19
GinaG	has anyone got Digital Caliper I could borrow? thanks!
	quote reply

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