Replacement pinch roller tires to replace the original gooey, melted rubber pinch rollers on your GRT/Module 8 carts.  I try to get these as close to possible to the original width when I cut these.  But they will not all be perfect. 
 
These press onto that hub.  You will need some kind of rubber safe lubricant to get these onto the hub, it is a tight fit! 
 
Personally I use a "dry" spray silicone lubricant available at any hardware store.  This lubricant will dry over time.  You will need to lubricate the outer edge of the plastic hub where the tire will be slipping over it (just the outer edge, not the inner part where the tire will rest on the hub). And then press the tire onto the hub (I use my thumb to get it started on the hub then use the palm of my hand to finish pressing it on).
 
These are sold in 2 different sizes so choose carefully.  This listing is for the narrower GRT/Module 8 replacement tire which is designed for Module 8 and GRT cartridges.  And for the Ampex carts that used a narrow pinch roller hub with a flange on each side.   Not for Ampex carts that used the wider pinch roller (the most common).  
 
Shipping Details:
 
USA Customers ONLY, Shipping is a flat fee of $4.80
Orders $40 and over get FREE shipping via USPS Ground Advantage.
 
Canadian Customers, Shipping is a flat rate of 10.99 for up to $100 worth of merchandise
 
International Customers,
Shipping to most countries is $13.99 for the first $100 worth of merchandise.  This is through Asendia/USPS. 
 
Also, depending on your country, you may be charged an excise tax, VAT, etc on your end.  I do not collect any of these taxes or fees.