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Tester ?
Slack head angle is only really strange if you use a fork designed for something steeper. 43mm offset forks are designed for 73°-74° head angle, giving 52-58mm trail with a 700×23 tyre. If you use the same fork with a 70° head angle, you end up with 77mm of trail. A 70° bike really needs at least 60mm of fork offset if you don't want to feel like you're steering a barge up the Grand Union canal, and 70mm offset would be perfectly normal feeling.
Thanks but which bike ? : )
@Noca, can be strange yes
Tester ???