It isn't quite that simple. A little more info from OneUp about this:
" The upper tube remains the same for 34.9mm. We chose commonality of service parts over the weight reduction of a dedicated chassis.
The big advantage we have over guys like Bike Yoke who do a 34.9mm dedicated version is that our upper tube has a 26mm diameter (instead of 25mm). That means for a given upper tube ID, our upper tube can be ~30-35% stronger than a 25mm version. They are further constrained by the hydraulics running directly on the upper tube ID so increasing the wall thickness requires an entire hydraulic design."
Feb. 2, 2022, 10:24 p.m. - Cam McRae
It isn't quite that simple. A little more info from OneUp about this: " The upper tube remains the same for 34.9mm. We chose commonality of service parts over the weight reduction of a dedicated chassis. The big advantage we have over guys like Bike Yoke who do a 34.9mm dedicated version is that our upper tube has a 26mm diameter (instead of 25mm). That means for a given upper tube ID, our upper tube can be ~30-35% stronger than a 25mm version. They are further constrained by the hydraulics running directly on the upper tube ID so increasing the wall thickness requires an entire hydraulic design."