Using a cardboard template, it is quite a simple job to make an Aluminium version that overcomes the issue of knocking the seat tube. The gap between the tyre and the booster can be closer, and you may be able to shape the booster to fit properly.
Hence why I moved onto B4's for their design improvements, and ability to run Magura brakes on the rear.
1990 Marin Team Titanium, 1991 Marin Team Titanium, 1993 Marin Team Titanium, 1994 Marin Titanium FRS, 1995 Marin Team Titanium, 1995 Marin Eldridge Grade, 1996 Marin Team Titanium, 1998 Marin DH FRS, 1999 Marin Team Titanium, 1999 Marin Mt. Vision Pro, 2000 Marin East Peak, 2002 Marin Mount Vision
1988 Concorde Colombo, 1997 Colnago Master Olympic, 2005 Look KG481-SL, 2009 Look 586
WANTED: Marin Titanium - pre 1990, 1996 FRS, 2007 25th anniversary