Yes, it is indeed a Marin Titanium bar/Stem combi with 155mm in length. I had a Litespeed Ti stem fitted first, along with a Shogun Zero Titanium handlebar. I didn't like that though because the stem was too steep for me. I prefer flat and long stems.
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But a lot of tuning was done on the bike, which you can't even see. For example, I swapped the steel freehub body of the XTR M900 rear hub for the titanium freehub body of an XTR M950 hub (with bearing damage), just like the steel axle of the M900 for the titanium axle of the M950. The M900 front wheel hub also got a titanium axle from SRP. That brings a total weight saving of at least 64 grams.
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Greetings
Olli