In the ION-G15 we have answered your calls for a powerful 29 enduro bike with GEOLUTION geometry and have also provided the G15 with a GPI version, i.e. with Gates timing belt and pinion transmission. With the Pinion P1.12 transmission perfectly integrated into the frame we extend the already impressive capabilities of the bike and create a truly unique bike. Downhill, the GEOLUTION geometry and the low centre of gravity, as well as the lower unsprung mass on the rear wheel provide an undreamt-of downhill potential. Uphill, the combination of GEOLUTION and a full 600 % transmission ratio results in an almost limitless climbing ability. With the ION-G15 GPI you can not only leave the gas at the Enduro race or in the bike park, it is also fun at home on the trail lap. With its low maintenance and unrivalled range of applications, the ION-G15 GPI is a bike for every situation. Enduro race, big mountain adventure or technical alpine cross… it’s up to you.

https://en.nicolai-bicycles.com/frames/ion-g15-gpi/