The front fork spacers would make the forks slightly stiffer and take out a bit of the sag. But if your raising the rear end it put more pressure on the front so the forks dont really work the same and feel a bit softer if you no what i mean. So the spacer just try and put everything back into balance.

You can also use the spacers with out the rear raised as some people find the fronts on the XT's set just a little too soft for road type riding or even off road

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Plough on