Cornucopia of Awesomeness
Join Date: Oct 2004
Location: not where i used to be
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it's not quite as simple as just looking at fork rake.
If the two forks are the same length (axle->crown) then going from 28mm to 40mm rake will decrease your trail by about 10mm. Which will make things a bit less stable.
However, the road fork might be a bit longer than stock pista fork. Putting a longer fork on will effectively slacken the HT angle, thus you'd need the extra rake to give the same trail you had before with the shorter, 28mm rake fork.