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Technical & Reference Section => Tech and Restoration => Topic started by: Devilock on April 24, 2012, 03:51 PM

Title: Odd seatpost clamp size
Post by: Devilock on April 24, 2012, 03:51 PM: Can anyone suggest a generous size seatpost clamp (apart from a DC twin or hinge) as my Torker seatpost tube is just a little bigger than standard...?!
Title: Re: Odd seatpost clamp size
Post by: BENDYCAT ELEVENTEEN on April 24, 2012, 04:12 PM: burner one ;) 25. ?
Title: Re: Odd seatpost clamp size
Post by: Devilock on April 24, 2012, 04:54 PM: Quote from: BENDYCAT ELEVENTEEN on April 24, 2012, 04:12 PM
burner one ;) 25. ?

Not sure...I know its not due to any thick paint as its chrome. So what are the options...?? :-\

Im not using a Raleigh :yahoo_silent: :D
Title: Re: Odd seatpost clamp size
Post by: BENDYCAT ELEVENTEEN on April 24, 2012, 05:16 PM: well some of the tange ones are bigger - you got nothing to mesure it with ?
Title: Re: Odd seatpost clamp size
Post by: Devilock on April 24, 2012, 05:27 PM: Quote from: BENDYCAT ELEVENTEEN on April 24, 2012, 05:16 PM
well some of the tange ones are bigger - you got nothing to mesure it with ?

Tried a Tange & its too small! Not at home so Ill measure later... Ill probably just buy a twin bolt!

Also, my DC hinged doesn't really fit correctly either...!! :wtf:
Title: Re: Odd seatpost clamp size
Post by: BENDYCAT ELEVENTEEN on April 24, 2012, 06:39 PM: have seen a couple of post that are bigger - and as you know mk 1 burners are the same

give it a measure and we can see what we can dig out for you ;)
Title: Re: Odd seatpost clamp size
Post by: sid1972 on April 24, 2012, 06:56 PM: Gaz, had a oversized suntour clamp in gold for sale not long back, i am sure that was burner size. But its the standard suntour just bigger. ;)
Title: Re: Odd seatpost clamp size
Post by: BENDYCAT ELEVENTEEN on April 24, 2012, 07:06 PM: yer seem to remember there were two sizes -larger fitted burners as did the tange ???
Title: Re: Odd seatpost clamp size
Post by: sid1972 on April 24, 2012, 07:28 PM: Here you go - I sold it him for more than he is asking anyway, not sure if it sold though drop poolysheriff a pm.
(http://www.radbmx.co.uk/archive/albums/ii368/sid1972/Picture002-7.jpg)
Title: Re: Odd seatpost clamp size
Post by: Devilock on April 24, 2012, 08:15 PM: True...Gaz has got everything...!

Ill measure it...
& the seat tube...!!!
Title: Re: Odd seatpost clamp size
Post by: Devilock on April 25, 2012, 04:12 PM: Right, Ive measured the seatpost tube on the Torker & it has a circumference of 81.5cm. Measured my TA & thats 80cm... Why the fúck would it be 1.5cm bigger??!!?!? Stupid...
Title: Re: Odd seatpost clamp size
Post by: Devilock on April 25, 2012, 04:14 PM: Oh, I also measured a Tange seatpost tube & that is 80cm...
Title: Re: Odd seatpost clamp size
Post by: MartyC on April 25, 2012, 04:18 PM: Thickness of the paint/powder could easily account for that :-\ .
Title: Re: Odd seatpost clamp size
Post by: Devilock on April 25, 2012, 04:43 PM: Ah, no because all the frames measured are chrome...
Title: Re: Odd seatpost clamp size
Post by: Devilock on April 25, 2012, 04:43 PM: All original chrome too...
Title: Re: Odd seatpost clamp size
Post by: BENDYCAT ELEVENTEEN on April 25, 2012, 09:12 PM: ok so the seat clamp doesn't go on

does the seat post you have slide in smooth or tight ?

have you tried a couple of different post in there ?

you know the 1.5 mm could be a seat post that was slightly larger fitted and has opened up the seat tube top where the split is ?

maybe measure the thickness of the metal on a couple of your other bmx's to see what they are like ?

you may find it's thicker ?

you may also find that with the right seat post you can squeeze together the seat post about 1.5 mm and it will allow a good clamp on there ?
Title: Re: Odd seatpost clamp size
Post by: HEYWOOD BMX on April 26, 2012, 09:51 AM: Does a newschool clamp fit? If so,it`ll be a 28.6mm (1 1/8) internal diameter.
Title: Re: Odd seatpost clamp size
Post by: MartyC on April 26, 2012, 10:39 AM: Right:

80MM circumference = 25.4mm Diameter

81.5MM circumference = 25.9mm Diameter

http://www.rkm.com.au/calculators/calculator-circle-sphere.html

I would suggest that it's MM not CM as it would have to be a fooking huge frame :LolLolLolLol:

That level of difference is tiny, less than half a millimetre so most likely within a manufacturing tolerance. Try opening up the seat post clamp a little when you put it on or sand down the inside of the clamp with wet & dry to remove some of the material. Obviously opening the clamp up a little with a wooden wedge is the least damaging to the clamp!