Gear Hub fan
Join Date: Nov 2008
Location: Reno, NV
Bikes: Civia Hyland Rohloff, Swobo Dixon, Colnago, Univega
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
How do you mean "gum"? ALL bike tires are rubber and fabric, usually a combination of natural and synthetic rubbers. If the tread is sticky to the touch, making you call it gum or gummy, then the tire rubber is so old it has probably deteriorated and the tire will not last. Color can be anything these days and is primarily controlled by what additions are made to the tire rubber during manufacture.
Post a photo as that is the only way someone might be able to help you find a similar appearing tire.
Gear Hubs Owned: Rohloff disc brake, SRAM iM9 disc brake, SRAM P5 freewheel, Sachs Torpedo 3 speed freewheel, NuVinci CVT, Shimano Alfine SG S-501, Sturmey Archer S5-2 Alloy. Other: 83 Colnago Super Record, Univega Via De Oro
Visit and join the Yahoo Geared Hub Bikes group for support and links.