Originally Posted by
JoeTBM
Well, seat post sizes are normally taken in metric measurements? I would most likely bet that a 22.2mm is the size you need. but you don't show any pics of measuring the seat tube ID, just ones of measurements all the wrong seat posts.
I think we have a few (used) ones in the shop and can mail one to you. if you can't locate one locally. Check with any Co-op or volunteer shop to see if they salvaged some..
Is that a "C" clamp at the top of the seat tube?
That is a C clamp
I was just testing/confirming that the seatpost clamp will not close far enough to hold the 13/16"/20.7mm post. It won't. The clamp area at the top of the seat tube was spread open pretty good, so the larger 7/8" / 22.3mm post drops in an inch or so to where the seat tube split stops, then it won't go in any further.
Originally Posted by
maddog34
FYI.. 22.2mm seatposts are fairly common to many BMX bikes and older bikes like yours... 22.0 is available, but kinda rare... anything smaller is Hen's Teeth with gold fillings... Ebay shows Exactly ONE 21.8mm,as an example... there are Dozens of 22.2mm....
i'm thinking the frame clamp is crimped in too far.... and that your free Huffy may actually be a Murray in Huffy clothing... Murray used a 22.2mm Seat post sometimes... as per Sheldon Brown's Seatpost database and my personal experience.
Some folks make shims out of old pop cans by using heavy scissors to cut the cans... and well stocked Hardware Stores (ACE, not Home Despot) carry a stock of Shim Materials in various thicknesses... Aluminum is easy to work with and plenty adequate for the task...
check that clamp slot first, etc.
I guess it may be a oddball size between those. The "correct" size is definitely somewhere between the two measurements I have pictured. There is no way that larger post is going in, and the smaller post is way too loose. Despite the age, the bike is in apparently great condition. My calipers won't go into the frame far enough to actually measure the ID of the seat tube.
I was just surprised that a Huffy would have an oddball seatpost size - I would have guessed it would be the same as an old school BMX/Schwinn Sting ray. And I would have thought if there was a size between 7/8" and 13/16" it would have been listed on Sheldon's site. But I was also surprised it had a Sturmey Archer rear hub.
The 13/16" Wald I bought seems to be a half millimeter thinner that specs suggest it should be, but I'm pretty sure that wouldn't make the difference.
The 21.8mm post you referenced seems like the the right size, and I guess if it exists, it was made for some bike at some time!! But a shim will do the trick.