13" on mine - bit more space and no issues with steering. Saying that, i used to run a S2A Land Rover with rather large tyres, on a 14" steering wheel so it may be said I have reasonable 'upper body strength'

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"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10