Where is serial number on a roadster trike - Cycling

I assume you mean the handlebar stem does not fit into the fork steerer. Approximately the same diameter is not good enough. The stem has to be the correct size for the fork. The two most likely sizes are 22.2mm and .833 inches (21.15mm). Most stems have the size stamped near the bottom. There's a good chance your trike has a .833 steerer. Stems for that size are still available.

I’m happy to help further over the phone at https://www.6ya.com/expert/donald_f2ed37026a3ac881

Problem with bearing or axle, no way to be more specific. Have someone comfortable with mechanical items or a bike shop look at it. If fairly new refer to place purchased.

I’m happy to help further over the phone at https://www.6ya.com/expert/donald_f2ed37026a3ac881

Here is a place that looks up serial numbers for Schwinn. According to the site, your bike is from 1965.
Vintage Schwinn serial number lookup

Really? I just Googled "10x2 trike inner tube" (link below) and find lots of sources, including Walmart and Target.
10x2 inner tube Google Search

I’m happy to help further over the phone at https://www.6ya.com/expert/donald_f2ed37026a3ac881

http://www.schwinnbikes.com/support/owners-manuals

http://www.schwinnbikes.com/skin/frontend/schwinn/default/pdf/Schwinn-Roadster-Trike-Manaual.pdf

Lists the parts so you can convey what you need to a supplier.

Page 1 has the number to call. 800 626-2811.

either go to a bike shop for them to order one for you, or go online and order one yourself. The manufacturer should sell them.

Perhaps this will help...

http://www.schwinnbikes.com/skin/frontend/schwinn/default/pdf/Schwinn-Roadster-Trike-Manaual.pdf

You can contact dynacraft directly but you have to give them the serial number of the trike. http://dynacraftbikes.com/contactus.php

I have the razor scream machine which is made by the same manufacturer but dynacraft won't sell me the wheels unless I give them a serial number from their hotwheels powerslide model. Could you post the serial number on your trike? It would really help out myself and all the other scream machine owners who currently can't get replacement wheels.

Thanks,

-Alex

buy a tire repair set from wal mart and repair the problem.

You need to take the old seatpost from the trike to a good bicycle dealer and tell them you need a seat to fit it. Most good dealers have parts for childrens trikes and bikes or can order them for you.