WTB Cross Boss with Stan's Iron Cross

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Permalink Reply by Paul on May 14, 2015 at 7:57am

From my understanding TCS's tire in a 700c/29" size will not work with Stan's rims.  However I was told by Stan's that they will work on the Alpha rims (340 and 400).

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Permalink Reply by tucker walsh on May 14, 2015 at 8:51am

thx - ended up putting Maxxis Mud Wrestlers on my new Stan's Iron Crossers...went on like a champ. 

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Permalink Reply by Andrew Putney on October 19, 2015 at 7:23pm

Not sure if you are still interested but I have the Stans Grail rims and the WTB Cross Boss on them. Got them on the rim easily needed a compressor and soapy water to mount them. So far tires are pretty awesome and have helped get me on a couple podiums this year. 

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Permalink Reply by Paul on October 20, 2015 at 5:49am

I am running them on Alpha 400's.  Had to pump them up to 60 with a floor pump to get them to mount, but now no issues at all with about 20 rides and 2 races on them.

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Permalink Reply by Andrew Putney on October 20, 2015 at 6:48am

How low of pressure are you running them at? I feel like I can go down to the low 20s without bottoming out but not sure if that is improving the traction. Raced them on Sunday at 23.5F and 24.5-25B right after the frost melted and slid out while cornering a few times on the wet grass. I didn't feel like I had the traction even in the drier sections that I had the day before when I was at a few psi higher in each tire. 

Wondering now if lower pressure in tubeless is not necessarily better in slicker conditions like tubulars. Maybe you need to find that sweet spot and stick with it. 

23.5F and 24.5-25 in the back

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Permalink Reply by Paul on October 20, 2015 at 8:34am

I weigh 145 and was running the same pressure this weekend.  I think I can go lower as I had Slant Six's down to 21psi last year, though I bottomed the rim on some big roots...luckily with no damage.

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Permalink Reply by Kris Fleming on October 20, 2015 at 8:37am

Were you folding the tire over in the corners?  That could be causing you to slip and slide if the tire is squirming under you.  Also isn't the tread on the CrossBoss relatively closely spaced?  May not be great in wet/slick conditions.  Just saying there could be alot of factors besides PSI. 

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Permalink Reply by Andrew Putney on October 20, 2015 at 10:42am

What does does folding the tire over in corners feel like? Is it different than skidding?

I guess that is my question: Were the conditions to slick for the tire tread of the cross boss tire or was my pressure to low causing the tire to fold over?

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Permalink Reply by Kris Fleming on October 20, 2015 at 11:39am

It could feel like skidding or fishtailing.  Basically when you fold the tire the casing/sidewall is moving sideways separate from the tread and rim.  It is often referred to as "squirming" as well.  Think about the tire wiggling under the rim. 

 

Tire pressure is a personal thing, your weight, riding style, the tire, course terrain, conditions, etc. will all play a factor in what will be optimal for you in a given situation.  There is no silver bullet.  Often the elite riders are doing multiple passes with slight tweaks to pressure to try to find that optimal combination of cushion and traction.  So this is just one data point for you.

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Permalink Reply by Paul on October 26, 2015 at 8:13am

My pumping readings this for this weekend where 20psi rear and 19psi front.  No issues.

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Permalink Reply by Andrew Putney on October 26, 2015 at 12:02pm

Just out of curiosity, whats your weight? Was this in a ross race?

I am 165lb and I get great traction in corners and steep climbs at this psi. Tires feel a bit squirmy though when remounting and I am afraid they might fold over on themselves during hard cornering. 

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Permalink Reply by Paul on October 26, 2015 at 12:32pm

I am 145lbs and this is for cross racing.  The course yesterday was in an apple orchard with rain overnight.  Very firm ground with wet grass and some slime over hardpack in the corners, there were MANY corners.  elevation change was only about 35 feet for each 1.7 mile lap. 

 

I will try gong lower if it get real wet and muddy.

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