Originally Posted by base2

I forget the exact number of grams. But I do remember that the combination of ultra-light liner & a 67 gram tube came out exactly the same as a standard weight tube by it self. Given the extra flat protection of the liner, it seemed a "no-brainer" Theory being if it gets through the purpose built liner, any tube in there wouldn't have made a difference anyway.

I've long ago lost track of which bike has what, so if that tells you anything about ride quality.

No matter the combination 4 ounces per bike (worst case IIRC) was preferrable to 300 grams per tube!