Kommisar89

Trail is the distance between the contact patch of the tire on the ground and a theoretical point on the ground ahead of that determined by drawing a line along the steering axis (imagine a line going straight down your steering tube) to the ground. The greater that distance, the more your front wheel will resist turning. Conversely, the shorter that distance the less resistance and if there is to little resistance you get twitchyness. A track bike or crit bike might be intentionally designed with shorter trail for quicker steering response while a touring bike would have longer trail to provide stability. With Short trail, every small bump, rock, or groove in the road can send you off in a different direction requiring a steering correction. In extreme cases this can be dangerous. A smaller diameter wheel will effectively shorten the trail. Whether this causes a problem or not will probably depend on the bike's original geometry, how much trail it had to start with, and how sensitive you are to the effects of that.

If we had all of the measurements we could determine exactly how much trail would be reduced but even then we could only speculate about what the practical effect of that might be. Really all I can say is try it and see what happens.