01Findable
Tioga
PowerBlock OS20
1.60451 ISO
The practical default. Tioga still lists it and current U.S. stock can be found without much hunting.
Manufacturer listing ↗Tire availability · field guide 03
OS20 tire availability.
There are very few choices, and a manufacturer listing does not mean a tire is sitting on a shelf. This is a manually checked reference—not a live inventory feed.
The number that matters
451ISO bead-seat diameterA tire must explicitly identify the 451 mm bead-seat diameter. A normal decimal-size 20-inch BMX tire is usually 406 and will not fit.
Last full review
Jul 15, 2026
Every shop status below carries its own verification date. After 30 days, the site automatically labels that result Needs recheck.
Stock can change at any time. Always confirm the size and availability with the seller before ordering.
Current manufacturer listings
What can you buy?
Four listed sizes. Two manufacturers. Wider tires are the difficult part.
02No confirmed stock
Tioga
PowerBlock OS20
1.85451 ISO
Tioga continues to publish the specification, but every U.S. retailer checked was backordered or sold out in this size.
Manufacturer listing ↗Retailer checks
Full Tilt Bike Co.The storefront's 1.85 variant is marked out of stock.Out of stockChecked Jul 15, 2026Dan's CompBackorderChecked Jul 15, 2026Powers BMXOut of stockChecked Jul 15, 2026Unconfirmed
An August restock has been mentioned by riders, but we have not found confirmation from Tioga. A direct Instagram inquiry received no response.
03Limited stock found
Vee Tire Co.
Speed Booster OS20
1.6042-451
A current OS20 option. Stock is uneven between shops, but at least one U.S. listing showed tires ready to order.
Manufacturer listing ↗04No confirmed U.S. stock
Vee Tire Co.
Speed Booster OS20
1.7547-451
The tire is still listed, but the U.S. retailer pages checked were backordered or sold out in this size.
Manufacturer listing ↗How this stays honest
Checked by hand. Dated in public.
Several retailers prohibit automated scraping. This page favors a small number of human checks over pretending to provide real-time inventory.
01
No stock promises
A green status means the listing appeared available when checked—not that it will still be there when you click.
02
Every check gets a date
Retailer results are independently dated so you can judge how much confidence to place in them.
03
Old checks flag themselves
Anything more than 30 days old changes to “Needs recheck” until it is manually verified again.