hey guys we have an issue We have an OCC Schwinn stingray bike with no original seat, well we have a large regular bike set that looks good for the frame size wise but the issue is the Regular sized seat posts are too small for the seat tube but with the tightening clamp thingy being so far down the frame i'm not sure a shim will work any advice would be welcome, also considered contacting a local blacksmith to see if he could possibly widen an already existing tube as it seems to need to be half again as large to fit.

You can find used seat posts for the Schwinn Stingray on Ebay and other places. Google. There are also reproductions made for it. Here is one such seat post: https://luxlow.com/products-page/sea...ser-bike-size/

Here is another great source...
Let Me Google That

I 'm not sure I made what I'm trying to fix clear enough I'm not talking about a Vintage stingray I'm talking about the Stingray Orange County Chopper Bikes produced in the early 2000's it has a smaller (20IN) fat wheel on the back and a larger regular (24in) wheel on the front and resembles a motor cycle we have a train load of seat posts but their all too small and the clamp is located under the cross bar that runs up to the fork.

it looks similar to a motor cycle and came with a bucket almost Banana type seat which we didn't get with the bike, instead we have a large regular bike seat that will work however the Seat posts we have about twenty in all are all to small to fit in the frame properly.

Thank you though If i were looking for a vinatge stingray piece that would have helped a bunch.

The fact that you do not have the correct size seatpost means that you have to measure what size you need. Bike shops have a tool designed to measure the inside diameter of the seat tube. With this information you will be able to search for the correct size seatpost. You have to have the correct size so that the post will be properly supported by the frame where it passes through the top tube

There is no such thing as a "regular size" seat post. The most common sizes vary from about 25.4mm up to 34.9mm in .2mm increments. Measure the internal diameter of the seat tube and buy the correct size post.

measure the inside of the seatpost accurately and precisely. the only seatpost that will fit is the size that matches the inside of your seat tube within 0.1mm. there's very little wiggle room there. if it's too small by 0.1 mm, you won't be able to clamp it down. if it's too big by 0.1mm, you'll have to hammer it in and it will be a giant PITA to pull back out when you need to.

Any bike shop will have one of these. Just drop it in the seat tube and look at the measurement. No blacksmith needed!

I have a bunch of seat posts in my garage. Where do you live?

we are the local bike shop LOL we live in a rural area where bicycles are seen as children's toys mostly the nearest bike shop is 200 mi away in Independence Mo.

North central MO.

we have seat posts for Most bikes mountain bikes racing bikes regular cruiser's three speeds and children's shingle speed bikes tehri all similar in size this what i meant by regular size this is easily half again as big as our largest post..

As the OP might be understanding seat post "correct" size is not a rigid formula of spec quantity. When a manufacturer (and that's not the brand on the frame more often these days) specs a bike they do it with whatever fits their needs and not what the after market, the LBS or the consumer has available. Sure with bike that are sold within the LBS channels more specs are published, and held to... But the masses of bikes sold through non LBS channels are not constrained by the feedback system of your LBS/brand dealer relationship.

When dealing with a crushed down clamping section pf the frame the first thing is to reestablish the clamp area to round and OEM size, or second to not disturb a post's fit within the seat tube below the clamp. Untill this is done any "measurement" is mere speculation. I'll add that a sizing tool with many diameter steps is fine for the amount the step fits within. Inn other words for the top , aprox, half inch but worthless for the rest of the post's fit. They are good for driving off the scourges of the earth though (borrowing a funny from the UBT catalog years ago). Andy