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Front end 'wobble' Marin Muirwoods 2016

andUKandUK Posts: 85
edited August 2016 in MTB workshop & tech
Brand new Marin Muirwoods 17" 2016 29er- rigid steel frame/forks trail bike.

Problem: when I take my hands off of the handlebars the bars start to shimmy/wobble/oscillate which becomes more and more pronounced in a matter of seconds until I'm obliged to grip the bars again. I've only done about 100 miles on it on roads and trails, and it's been like this from new.

Before you ask: everything is mechanically sound ie. the wheels are tyres are balanced, the wheels run true, the frame and forks are true, the wheels are centred and secure in the frame/forks AND the headset has no play in it whatsoever ... and anything else, all sound! I've checked, tested and re-checked.

This phenomenon is not speed wobble, as it occurs at slow, medium and fast speeds.

I have never experienced this before on a bike (funnily enough I also own and ride a 1996 Marin Muirwoods, rigid steel frame)

I wrote to Marin to query if this was anything to do with the materials and geometry of the bike and got a stock answer back listing possible mechanical causes despite my having told them all is mechanically sound.

Any suggestions?

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