Do I spy Mavic ATB cranks on that photo?
Mavic ATB Cranks?
If you're using 650B tubeless tyres I'm not sure why you wouldn't just run then tubeless, rather than stuffing a thick inner tube in there.
the moment. The close up of the same crankset on a 2006 bike might help you to identify the make. The important factor is to have a small PCD in order to accommodate the minor axis of the elliptical granny wheel. For the Clelands NRS.
I use 58mm PCD chainsets sold under the Thorn brand.
Tubeless tyres and inner tubes?
The problem is that tubeless tyres are fine at 30lbs PSI but at 15lbs PSI they become unstable when cornering. The Idea of using heavy duty inner-tubes as well as tubeless tyres, is based on the fact that the original Cleland Hakka tyres used large, heavy duty tubes that weigh 8 oz each. Some heavy duty Kenda tubes have just arrived in the post, so I will soon know if this works. It is important to use tubeless rims as they don't let the tyres slip until the valves rip out.
But why carry around the extra weight of a heavy duty inner-tube?
On smooth surfaces it only makes sense in terms of increasing tyre contact patch and so the grip. On rough surfaces, like cobble stones, the low pressure tyres can absorb all the vibration and so reduce the rolling resistance. Tyre design is important in that an inflexible tyre will have a very high rolling resistance when run at low pressure. The original Cleland tyres are thick but flexible, and are remarkably quick off-road.