Re:
Hello.
Surprised you are having grief with the Crossmax, although I have never tried to run them with a tube. I bought a Stumpjumper in 2000 which came with the black flat blade spoke, ceramic rim SLRs. Initially I rode them with the Specialised tyres, then some Hutchinsons. I did have to pump them up every week or so, but there was no sealant available at that time and you were not recommended to use any. I stopped cycling soon after and only picked it up again a few years back. I went out to get new tyres but they would not stay up, this is when I was told "well they won't without sealant", and the shop refused to believe that I have never used sealant in a tubeless set up before. Since then I have successfully used Maxis , Specialised IRC and Panaracer tyres. The maxis are not a true tubeless but they work OK. Cafe latex is a bit thin and I found Stans, while expensive to be excellent. The only time I have had trouble with tubeless is on a set of Stans Flows where I tried to use a non UST Continental Protection tyre - cross kings I think and that was with the cafe latex. It just peed out through the side walls and refused to seal on the rim. You are quite correct in trying to fit two tubes to tyres which are covered in latex trail side is not an experience I would care to repeat. The crossmax are really good rims and if you use a true UST tyre with a bit of stans sealant in there should be bulletproof. Non UST can be a bit thin on the sidewall and just not stable enough on the rim at the pressures you want to run at. The tyres are a tight fit and difficult to mount. You need a bit of tyre soap or just soapy water to get them to pop on the bead - they go with a bang! Inside of the tyre should be scrubbed out with soapy water and dried to remove the mould release agent. Otherwise your sealant will not bond to it. I mount the tyre, pump it up until it seats both sides. Deflate it and pop a small area off one side to pour in the sealant. Blow them back up and swirl them round to spread the sealant. Adjust the pressure and off you go. Mine have never been in a truing stand and the ceramic is just starting to wear off in places. Best pair of wheels I have ever owned. If you do decide to use tubes, the Stans rims are good and look OK once you have peeled the stickers off. Disc only though. Otherwise Mavic?
Cheers - Chris.