What's the wheelbase of your bike? Even my G16 in large fits (just) on a 591 rack. Front wheel hangs off by about 2cm but it stays put, no probs.
1285mm according to the geometry chart.
I found a couple brands that have fork clamp ones that look good and a bit more reasonable than Thule.
Atera and Yakima, their HighSpeed looks good.
Mine is 1328mm, are you sure you've adjusted and slid everything as far as it can go?
@M_V started
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What's the wheelbase of your bike? Even my G16 in large fits (just) on a 591 rack. Front wheel hangs off by about 2cm but it stays put, no probs.