DT's Competition spokes may have a maximum length of 300mm as the manufacturer's standard stock.
The problem is that with all Competition builds using the tangent lacing pattern, we might not be able to source spokes for the non-drive side.
Champion spokes do go up to 315mm if you special order and wait, but
we'd never use different spoke lengths on the drive and non-drive sides with Champion on the non-drive side anyway.

I'll need to be more careful about hoarding spokes keeping Competition spokes in stock as a priority item.