4x4 CNC Router build. 45hsr rails?

[CATCH22]

I got a really good deal on 2 hsr45 rails with 2 bearings for each. I'm thinking about using them for my cnc router build , do you guys think this is a bad idea, they won't be used on the moving gantry only on the frame part.
Any input would be greatly appreciated.
Thanks Mike

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[pippin88]

They may have more friction / require more motor torque. Depends partly on the preload.

I would happily use them for a router.

(I would go and pay lots of $$ as they are overkill but you already said you got them cheap)