TruTune time...

25/10/25 16:12 Filed in: Gear

Both the enduro bikes at my house are running TruTune full-size inserts. And it is a good thing they are. Set up with a reasonable amount of sag and in our typical riding, we both sometimes see full travel on the O-ring. In the first couple of rides on my Zeb fork, I was leaving behind 25+ mm of travel while running the fork on the soft side.
They do what they claim - slow down the ramp in pressure as the fork compresses. The theory, for those who don't want to go seeking the website and reading all the info, is that the carbon inside the spacer adsorbs air as the pressure increases. Adsorbed air is not part of the gas in the air spring, so effectively it is reducing the amount of air in the spring space as it compresses - pressure increases more slowly than it would otherwise. And on rebound it releases that air just as quickly.
I find it pretty easy to tip into the travel, supportive in the mid-stroke and still willing to use full travel on a big hit. Just the way I like it. RockShox could have made the spring chamber larger, but they didn't, so this is the next best thing.

I was slightly concerned that the fork oil would seep into the device and clog up the carbon. Doesn't seem to have happened. You'd think they'd build it to avoid that.

Michael Hanslip Coaching

If you want to go faster, you have to pedal harder

TruTune time...