GXR Ti and KOS FAQs

I want to run the biggest tyre possible. How big can I go?

We have designed the GXR and Kevin of Steel) to work well with tyre sizes around 700c x 40mm or 650b x 50mm (27.5" x 2.0").
We like to run Vittoria Mezcal in the 27.5" x 2.1" size. Anything larger than that may introduce poor chainstay clearance or even some rubbing. This is 100% normal when going to the largest tyre size that will physically fit in the frame.

Note also that there are other factors that affect the ultimate width of the tyre, such as internal rim width and tyre tread pattern. Do not just go by the tyre label.

Rider discretion is advised.

I want to attach bags. What will it do to the frame finish?

Curve's steel frames are finished with high-quality and durable paint, but the paint is not unaffected by rubbing from bike bags or rock strikes etc.
If you want to keep your paint looking pristine, we recommend that you use some kind of protective film - especially in the high-wear areas where bag straps are in direct contact with the frame.

Stock Ti frames are not painted, but bag rub will affect the surface finish. The lighter, brushed, finish can be refreshed using a fine abrasive pad, but the darker blasted finish can only be refinished by media blasting. To keep your Ti frame looking pristine, we recommend using protective film.