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So when I use 25mm tires, on the front the clearance is too tight above the tire to the bottom of my brake arm. I got some gravel stuck in there and locked it up once.
Someone suggested using a new shimano 105 brake arm, which he said has better clearance for the big tire trend.

Is that true and are they compatible with the sram force cable pull?

thanks for your ideas
 

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Here's Lennard Zinn's experience with mixing Shimano calipers with SRAM levers.

Your other solution is to buy a steel fork. A steel fork crown has a smaller volume than a carbon fork crown, giving you more room under the crown. The caliper mounting bolt will be closer to the edge of the steel fork crown, improving the caliper to tire clearances.

Below is a view of a Richard Sachs fork crown and a SRAM brake. Note the position of the brake shoe in the slot. Note the tire clearance. You hardly would need a more expensive, lugged crown fork to solve your problem. Many manufacturers such as Independent Fabrications can build a unicrown fork with similar clearances for less. It's all high quality stuff, and it solves the problem carbon forks have created.

<a data-flickr-embed="true" href="https://www.flickr.com/photos/[email protected]/3439872702/in/album-72157616635323601/" title="Road-2-2"><img src="https://c7.staticflickr.com/4/3551/3439872702_afabc3e1ce_z.jpg" width="640" height="427" alt="Road-2-2"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>
 

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So when I use 25mm tires, on the front the clearance is too tight above the tire to the bottom of my brake arm. I got some gravel stuck in there and locked it up once.
Someone suggested using a new shimano 105 brake arm, which he said has better clearance for the big tire trend.

Is that true and are they compatible with the sram force cable pull?
You should look carefully at the clearance between your tire and your fork crown. In most cases, the brake is the same distance from the tire as the fork crown. We see the brake and don't see the fork so we think it is the brakes that are limiting clearance. Front and rear you will often find that the frame has the same clearance as the brake.
 
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