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Will a 26" inner tube work well? Do I simply cut the tube in half so as to cover the spoke holes?
Your thoughts please.
1) you'll still need rim tape to cover the spoke holes
2) in theory it might, I run stan's flow 26" strips on bontrager 29er rims and it's fine with non-UST tyres, the stans strips are much thicker under the spoke bead though so will offer much better sealing, and won't interfere with the bead locking, so will be more secure.
I recommend going with a stretched stan's rim strip for the extra sealing robustness and mostly for the bead locking robustness to avoid burping and your tyre rolling off the rim
I'd have thought a 26" tube won't be a very tight fit on th erim, maybe try a 24" tube if a normal 20" one wont strtch that little bit more?