Mehr Fotos im Album "1986->88/89 RAW Klein Pinnacle - with parts & ads (pre/non "elite", yet no paint & light!) 🔩":
1986-Named & Designed Ground Control Tire (S) - This one lauched with new Label 1990/91 (also Kevlar bead) Umma out of box outside WTB im Album 1986->88/89 RAW Klein Pinnacle - with parts & ads (pre/non "elite", yet no paint & light!) 🔩
1986: Charlie Cunningham designed (and Jacquie Phelan named) the Ground Control tire
https://www.wtb.com/blogs/wtb/9090459-throwback-thursdays-1986-wtb-designed-specialized-ground-control-tire
Durometer test for rubber hardness on the Umma Gumma 1.95" showed a 62/A hardness.
(www.BikePro.com)
Shown Umma Gumma foldable S version, listed in 93 ad
wtb history:
http://mombatbicycles.com/MOMBAT/BikeHistoryPages/WTB.html
https://www.wtb.com/blogs/wtb/9090459-throwback-thursdays-1986-wtb-designed-specialized-ground-control-tire
Durometer test for rubber hardness on the Umma Gumma 1.95" showed a 62/A hardness.
(www.BikePro.com)
Shown Umma Gumma foldable S version, listed in 93 ad
wtb history:
http://mombatbicycles.com/MOMBAT/BikeHistoryPages/WTB.html
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