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bobknh

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Reply with quote  #1 
Does anyone know the max. tire size for the Trek Boone Canti. CX frame? Trek is reluctant to make any tire size claims beyond the UCI CX max of 32mm tires. Although an unpleasant experience on a freshly graded county road gave me second thoughts yesterday, I'm still committed to canti's for my type of gravel grinding.
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NoCoGreg

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Reply with quote  #2 
I don't have first hand experience, but online I've seen 38mm in a couple places and pic's showing lots of space with a 33mm tire installed.  Disclaimer: the disk and canti frames have different rear dropout spacing so the clearance might differ too.  Here are a couple links:
http://forums.roadbikereview.com/cyclocross/trek-boone-max-tire-size-354475.html

http://nbxbikes.com/about/the-all-new-trek-boone-cyclocross-bike-pg659.htm

In case you didn't already see this review by CX Mag, the 56cm Boone 7 bike without wheels weighted 10.5 lbs (17.3 lbs with wheels which I assume had the 33mm CX tires).  So if one swapped out the CX tires for some fast 28mm road tires I'd expect to see it in the 16.5 lbs range.  That's only slightly more than the better carbon fiber road bikes!
https://www.cxmagazine.com/trek-boone-7-disc-cyclocross-bike-review-cyclocross-magazine

Happy shopping!
Greg
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bobknh

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Reply with quote  #3 
Quote:
Originally Posted by NoCoGreg
I don't have first hand experience, but online I've seen 38mm in a couple places and pic's showing lots of space with a 33mm tire installed.  Disclaimer: the disk and canti frames have different rear dropout spacing so the clearance might differ too.  Here are a couple links:
http://forums.roadbikereview.com/cyclocross/trek-boone-max-tire-size-354475.html

http://nbxbikes.com/about/the-all-new-trek-boone-cyclocross-bike-pg659.htm

In case you didn't already see this review by CX Mag, the 56cm Boone 7 bike without wheels weighted 10.5 lbs (17.3 lbs with wheels which I assume had the 33mm CX tires).  So if one swapped out the CX tires for some fast 28mm road tires I'd expect to see it in the 16.5 lbs range.  That's only slightly more than the better carbon fiber road bikes!
https://www.cxmagazine.com/trek-boone-7-disc-cyclocross-bike-review-cyclocross-magazine

Happy shopping!
Greg

Greg - thanks for the input. Looks like the tire limit on the Boone Canti, are about the same as my Swiss Cross Canti. I'm currently riding around on 35 mm Compass Bon Jon's. that should work well with the Boone. Something to think about.
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Overhill

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Reply with quote  #4 
bobknh: I have a Boone canti. I currently am riding 38s, which measure a little over 39. I have had 40s on the bike with sufficient clearance and expect that it would take 42s. At this size, rim size and individual tire construction may make a difference. I also have a set of Conti 4000, size 28, which makes this a nice road bike. I like the comfort and flexibility of the Boone for my rough roads and gravel.
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bobknh

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Reply with quote  #5 
Quote:
Originally Posted by Overhill
bobknh: I have a Boone canti. I currently am riding 38s, which measure a little over 39. I have had 40s on the bike with sufficient clearance and expect that it would take 42s. At this size, rim size and individual tire construction may make a difference. I also have a set of Conti 4000, size 28, which makes this a nice road bike. I like the comfort and flexibility of the Boone for my rough roads and gravel.

Thanks for the info. I do the same thing with my steel Ritchey Swiss Cross Canti. BTW, I've found that my 35 mm Bon Jon's ride almost as fast as the Conti 4000 II S. No need to change tires or wheels between high speed pavement rides, and gravel grinding. Not quite ready to ditch my Swiss Cross yet. It's a great bike. OTOH --- the Boone promises a more compliant ride and will be about 2 pounds lighter than my Swiss Cross. Hmmmmm!
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NoCoGreg

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Reply with quote  #6 
Quote:
Originally Posted by Overhill
bobknh: ... I also have a set of Conti 4000, size 28, which makes this a nice road bike. I like the comfort and flexibility of the Boone for my rough roads and gravel.

Any chance you have measured your Conti 4000's?  I have a set of these and the 28's measure almost 31mm on 19mm (external width) Mavic CXP33 and Open Pro rims.

Thanks,
Greg
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bobknh

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Reply with quote  #7 
Quote:
Originally Posted by NoCoGreg

Any chance you have measured your Conti 4000's?  I have a set of these and the 28's measure almost 31mm on 19mm (external width) Mavic CXP33 and Open Pro rims.

Thanks,
Greg

I never took a precise measurement. But, I had a pair of the Conti 4000 IIS 28mm installed on a set of HED Ardennes which wouldn't fit on my Lemond Washoe road bike. The Washoe was spec'd to fit up to 28 mm by Lemond; but the rear tire rubbed on the brake bridge. I suspect that you are correct -- the actual dimensions of the Conti 4000 II S is probably over 30 mm. This seems to be a common problem in the industry since there is no standard way to measure tire diameter. Also, the actual diameter will vary with the rim geometry. That's one of the reasons Trek is reluctant to give you max. tire width spec's. for their bikes. The only reliable source is first hand feedback from users. That's why I posted my question. Another example; I believe Panaracer changed the tire width spec. on the 35 mm GK TR 38 mm --- a fact that several contributors in this forum where quick to point out. Stay tuned!
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Overhill

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Reply with quote  #8 
NoCoGreg: My Conti 4000s measure about 30.5 on Bontrager RXL rims, so well over the listed 28 width.
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bobknh

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Reply with quote  #9 
Update: I was checking the spec's. on the Boone Canti frameset on the Trek website and discovered that the the frameset in my size 58 cm is out of stock. I believe that Trek makes frames in product runs in advance of expected seasonal demand and gives priority to full bike builds over framesets. If true, that means I may have to wait awhile - maybe until next winter- for the frameset to be available. In any case, I'm not ready to buy a new frameset  yet, but I do hope that Trek continues to manufacture a canti version of their CX bikes.
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