Item # CLM000J
Clement BOS Tire - Tubeless $70.00
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Only for the muddiest conditions
- Familiarity: I've used it once or twice and have initial impressions
I usually run a PDX in the front and MXP in the back, both tubeless. But after a disastrous muddy race with that combo and more rain in the forecast a few weekends later I ordered the BOS for the back instead. From the get-go, I noticed two things. First, on my 19mm ID wheels, both the PDX and MXP measure out to about 37mm wide, but the BOS was right at 33, so much narrower. Secondly, this tire is much stiffer than the other two (probably because of the heavier tread) and was much, much, more difficult to get to seat tubeless. The MXP and PDX took about 2 minutes each, the BOS literally took an hour of swearing and a ton of soapy water. But once I finally got the bead to pop it sealed up well and held air nicely.
On race day (and pre-riding the day before) it didn't rain nearly as much as forecasted and the tire was clearly out of its element. On loose-over-hard conditions, dust, or soft but not washed-out soils the aggressive tread and narrow width means the tire just digs a rut and doesn't actually propel you forward under power. The result was similar to a mud-covered tire: tons of work to just spin in place. By the end of the race I definitely wished I had just left my MXP on the back.
I think there are conditions where this tire would do well, namely total mud bogs where you want a tractor tire/paddle wheel effect. It does shed mud extremely well, is very predictable in corners (at least out back) and doesn't feel slow on other surfaces despite the aggressive tread, but hard efforts on loose surfaces or going up short, steep hills are wasted digging into the ground instead of rolling over it. Unless your race is looking like a total washout, I wouldn't recommend this.