Mount Spacing Guide

BUP Labs makes a number of different mount options from generic mounts to specific mounts for saddle brands with built-in accessory connections. How these will fit a particular saddle varies. Use this page as a guide to help determine the fit on your saddle and available space for saddlebags, etc..


  • Each column shows the general spacing for each supported kit combination.
  • Bryton, Garmin Varia, and Magene radars all have similar positioning so only the Garmin device is shown.
  • If a space is empty, it means there are no supported configurations for the mount base and device combination.
  • All measurements are taken from the center of the rails on a generic saddle.
  • Actual positioning will vary slightly depending on the rail shape, positioning of the saddle on the seat post, and variations in various OEM saddle specific mounting interfaces.
  • Extensions can be used to extend the spacing by 25 mm (1 in) or 35 mm (1.5 in) (sold separately)
  • Chaining extensions together is not supported and voids the warranty.

Bryton - Garmin - Magene



Garmin RCT715



GoPro or Similar


Garmin-MOUNT TYPE spacing image
Garmin-MOUNT TYPE spacing image
Garmin-MOUNT TYPE spacing image
103 mm / 4-1/16 in
Bryton | Garmin | Magene
108 mm / 4-1/4 in
Garmin RCT715
111 mm / 4-3/8 in
GoPro

Anatra™ Universal Mount (ST)


Garmin-MOUNT TYPE spacing image
Garmin-MOUNT TYPE spacing image
Garmin-MOUNT TYPE spacing image
123 mm / 4-7/8 in (Standard)    |    149 mm / 5-7/8 in (Extended)
Garmin | Magene
101 mm / 4 in
Garmin RCT715
116 mm / 4-9/16 in
GoPro

Fizik® Mount (ACE)


Garmin-MOUNT TYPE spacing image
Garmin-MOUNT TYPE spacing image
Garmin-MOUNT TYPE spacing image
133 mm / 5-1/4 in
Bryton | Garmin | Magene
138 mm / 5-7/16 in
Garmin RCT715
140 mm / 5-1/2 in
GoPro

Selle® Mount (ST)


Garmin-MOUNT TYPE spacing image
 
Garmin-MOUNT TYPE spacing image
127 mm / 5 in
Garmin | Magene
 
121 mm / 5-1/4 in
GoPro

Shimano® Mount (ACE)


Garmin-MOUNT TYPE spacing image
Garmin-MOUNT TYPE spacing image
Garmin-MOUNT TYPE spacing image
130 mm / 5-1/8 in
Bryton | Garmin | Magene
133 mm / 5-1/4 in
Garmin RCT715
136 mm / 5-3/8 in
GoPro

Specialized® Mount (ST)


Garmin-MOUNT TYPE spacing image
 
Garmin-MOUNT TYPE spacing image
115 mm / 4-1/2 in
Garmin | Magene
 
137 mm / 5-3/8 in
GoPro

Syncros® Mount (ACE)


Garmin-MOUNT TYPE spacing image
Garmin-MOUNT TYPE spacing image
Garmin-MOUNT TYPE spacing image
137 mm / 5-3/8 in
Bryton | Garmin | Magene
142 mm / 5-1/2 in
Garmin RCT715
145 mm / 5-5/8 in
GoPro

Trek® Bontrager® Mount (ST)


ATTENTION TO DETAIL Every part of BUP's products are carefully hand inspected during manufacturing and packaging.
CONFIDENCE We believe in our products and offer a strong 1-year warranty on all of our mount bases and mount arms.
MADE IN USA We try to source everything from the USA, from raw materials to the screws and paper.
ATTENTION TO DETAIL Every part of BUP's products are carefully hand inspected during manufacturing and packaging.
CONFIDENCE We believe in our products and offer a strong 1-year warranty on all of our mount bases and mount arms.
MADE IN USA We try to source everything from the USA, from raw materials to the screws and paper.