1.smaller tyre
2.shorter cranks
3.smaller cages as ed suggested
4.road forks with 45 mm rake......
results
1.less comfortable, limited tyre choice,more punctures
2.less power transfer
3.incorrect pedalling position
4.less trail, handling sluggish at low speed,more effort to "lean" the bike in corners
1.smaller tyre
2.shorter cranks
3.smaller cages as ed suggested
4.road forks with 45 mm rake......
results
1.less comfortable, limited tyre choice,more punctures
2.less power transfer
3.incorrect pedalling position
4.less trail, handling sluggish at low speed,more effort to "lean" the bike in corners