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eoGEAR — Seat Bag Sizing Guide

The purpose of this measurement is to insure there is enough clearance above your tire, so that your eoGEAR saddle bag doesn’t hang too low and rub on your rear tire. 

Measure from the bottom, rear corner of your saddle rails to the top of your tire (or fender if you are using one). Keep your measuring “line” parallel with the seat stays. Shown is a 54cm road bike with about 18cm (7") of space. 

If you are measuring for a mountain bike with rear suspension, be sure to account for the compression of the shock. 

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If this dimension is 16cm (6-3/8") or more & you plan to use a 2.3 bag..

...if you have the 2.3-DT “Dual-tab” bag (2223-GDT which has Velcro tabs on the back) then choose the 2324 Mini Seatpost Bracket; this bag will also mount to any “L” bracket. Better yet, select the 2.3-IA bag instead (# 3023-GIA) which has an Integrated Seatpost Adapter—no separate bracket is required.

If this dimension is 17cm (6-3/
4") or more & you plan to use Zippered SeatBag 4.8 or RollTop SeatBag 9.0...
...you will be OK with the built-in attachment hardware. No separate bracket is required. If you have little stuff in the outside pocket, you might be able to eek by with 16cm (6-1/4") of clearance.
If this dimension is 21cm (8-1/4") or more & you plan to use Rolltop 6.6, 8.2 or 9.3 bag... ...then choose the 2316 Standard Dual-mount Bracket (1st choice) or the 2314 Standard L Bracket. Because the Dual-mount holds the bag at an angle, it provides more clearance above the tire than the Standard L Bracket. The Dual-mounts also attaches to Brooks or Rivet leather style “wide rail” saddles without the need for the 2311 Wide-rail Adapter. The Dual-mount will not attach to an oval seatpost.
This is for road bike frames approx. 56cm tor taller with 700c wheels and most mountain bikes with 26" or 27.5" wheels.
If this dimension is between 19cm to 20.5cm  (7-1/2" to 8-1/8") & you plan to use Rolltop 6.6, 8.2 or 9.3 bag... ...then choose the 2316 Standard Dual-mount Bracket (1st choice) or the 2315 Highboy L. Because the Dual-mount holds the bag at an angle, it provides more clearance above the tire than the Standard L Bracket. The Dual-mounts also attaches to Brooks or Rivet leather style “wide rail” saddles without the need for the 2311 Wide-rail Adapter. The Dual-mount will not attach to an oval seatpost.
This is for road bike frames approx. 54cm tor taller with 700c wheels and most mountain bikes with 26" or 27.5" wheels.
If this dimension is between 15.5cm & 18.5cm (6-1/8" to 7-3/8") & you plan to use Rolltop 6.6, 8.2 or 9.3 bag...

...then choose the 2320 Highboy Dual-mount Bracket (1st choice) or the 2317 Supersize “L” Saddle Bracket. This 2320 Highboy elevates the bag 30mm (1-1/4") more than the Standard model. It can hold your bag in the “Highboy” position or down lower like a Standard bracket for more stability. It is heavier than the Standard Dual-mount bracket however.
This is for road frames approx. 50cm or smaller.

If this dimension is 22cm (8-3/4") or more & you plan to use the Zippered 6.8 bag...

..then choose either a 2314 Standard “L” or 2316 Standard Dual-mount Saddle Bracket. The “L” holds the bag more vertical, making the outside pocket easier to access. The “L” has room in front of the bracket (under the saddle) for a smaller bag or tie-on accessory. The Dual-mount design, on the other hand, is easier to install & remove, so it is better if you will be removing the bracket a lot. If you are using a Brooks-style saddle, then the 2311 Wide Rail Adapter must be used with “L,” but is not required with a Dual-mount. The Dual-mount only attaches to round seatpost, whereas the “L” attaches to many saddle rails, so the type of post is irrelevant. 

These are for road or cross frames approx. 54cm & larger.

If this dimension is between 18.5cm & 21.5cm (7-1/4" to 8-1/2") & you plan to use the Zippered 6.8 bag..

..then choose the the 2315 Highboy “L” or the 2320 Highboy Dual-mount Saddle Bracket. They elevate the bag 45mm (1.75") more than a Standard bracket. (Note: the Dual-mount tilts the bag at a slight angle, making the outside pocket of the 6.8 slightly more difficult to access.)

This is for road bike frames approx. 50cm to 56cm with 700c wheels, or smaller frames down to 46cm that use 650b wheels and most mountain bikes with 26" or 27.5" wheels.

If this dimension is on the smaller size, you must be diligent in cinching down the vertical “upside down Y strap” very tightly each time after opening the bag.

If this dimension is between 14cm & 18cm (5-1/4 to 7") & plan to use the Zippered 6.8 bag..

..then choose the 2317 Supersize “L” Saddle Bracket. This model elevates the bag approx. 75mm (3") more than the Standard bracket. It pokes up above the height of the saddle quite a bit, so extra care most be taken when mounting or dismounted, otherwise you may catch your leg on the bracket.

This is for road frames approx. 50cm or smaller.

You must have at least 24cm (9-1/2") clearance to use the 12.0 bag.
This bikepacking bag is commonly used on mountain bikes, so be sure to account for compression of your rear shock, if you have one.

 

*Dual-mount Brackets: We have received some very isolated customer feedback that the back of the thighs may barely touch the bag, when used with this bracket. This is usually due to a saddle set-back is far forward with smaller bicycle frames (i.e. 50-53cm) or, if the bottom of the bracket has rotated around the post to the left or right a little, making the bag off center on the bike.


Pros and Cons of Brackets

L Brackets — Pro’s

  • A secondary bag or spare tire can be stashed forward of the bracket and under your saddle for more capacity.
  • The L brackets place the bag well out behind your saddle, so your thighs will never rub against the main bag. 
  • Since it only attaches to rails of your saddle, it can used with oval seatposts.
  • Will work on a dropper seatpost as found on many MTB bikes.
L Brackets — Con’s
  • A bit of a hassle to attach or remove. If you don't plan to remove the bag and bracket often, then this feature may not matter. It uses two allen screws that attach to the rails of your saddle.
  • Brooks or Rivet-style leather saddles require the Wide Rail Adapter. Selle Anatomica leather saddles (with the Wide Rail Adapter) point the bag downward, providing less clearance than a Brooks or Rivet.
  • May not work with certain plastic saddles like Fizik Aliante Carbon, ISM Adamo etc. (see “Will NOT Fit” list below) 
  • When using the Highboy or especially the Supersize models, the bag is up taller behind the back of the saddle — you must swing your leg up much higher when dismounting your bike.

Dual-mount Brackets — Pro’s

  • Quick removal. Velcro or buckle straps that attach to the rails and a super-easy seatpost clamp (clamp is the familiar German-made SKS fender style device).
  • Works with suspended leather saddles like Brooks or Rivet without adapters.

Dual-mount Brackets — Con’s

  • Cannot piggy-back a secondary bag under your saddle (but you attach a small accessory like a spare tube with a D-ring strap).
  • The bracket tilts the bag at a slight angle, so it makes access difficult to the outside zippered pocket, like the RandoBag 6.8. 

eoGEAR “L” Bracket to Saddle Compatibility (not applicable to Dual-mount Brackets as they fit all)

The foundation for the Angled or “L” brackets is a hardware attachment system made by Minoura. it will attach to most (~ 80%) “plastic” or tech saddles with conventional-looking rails. Here’s our findings...

From the Minoura website (the Minoura Dual or Single Bottle Cage Holder is the foundation of most of our brackets): “Not compatible with I-Beam type saddle. Standard dual rail type only.”

Confirmed Fit
(w/o additional adapters or modifications)

  • Fizik Arione Tri2 (& most likley any Arione)
  • All Prologo models
  • Selle Italia Turbomatic
  • Bontrager Affinity (2013)
  • All Gilles Berthoud models
  • Brooks Cambium
  • Specialized Alias
  • Koobi AU Endura (2013)
  • Terry Fly (2016)
  • The Comfort Seat (Noseless saddle, 2015. Note from customer “The seat originally had some of the old style tabs on the back of the seat to hang an old style saddlebag. I normally remove them with a razor knife, since they really have no value.”)

Conditional Fit

  • Fizik Aliante. The standard bracket will fit, but due to the steep angle of the rear part of the rails, the bracket doesn’t sit vertical (it is off by around 10 degrees). A possible solution is to the use 2311 Wide Rail Adapter.
  • Fizik Kurve requires a pair of M5 x 25mm (.8 pitch, 30mm long is OK too) Hex Socket Cap Screws available through us special order or at some local hardware stores. The bracket only mounts to the very rear of the horizontal part of the rails and consequently the bag may hang lower than with other saddles. Be extra careful of your tire clearance.
  • Selle Italia Max Flite or Pro Link Light and similar Selle Italia saddles (see A in photo below). The attachment plate is too wide to fit under the saddle, so you must procure from a local hardware store the following parts: two M5 x 20mm (.8 pitch) Hex Socket Cap Screws (same as supplied but just a little bit longer), two M5 x .8 Pitch Hex Nuts, two larger nuts to serve as a spacer—get something like a 1/4-20 nut that will slip over the threads of the screw, and two “fine” flat washers 1-1/2" in diameter and 1/16" thick with a 1/4" diameter hole.
  • Most Selle SMP saddles (2012) are compatible when used with the new “short” 2311-SHT Wide Rail Adapter.

    eoGEAR bag size

Will NOT Fit

  • Fizik Aliante Carbon (2010) does not fit  as the rails are too far apart and the 2311 adapter is too thick to fit behind the rails.
  • ISM Adamo twin nose saddles (2014) are not compatible as the rear of the saddle cantilevers too far beyond the rear part of the rails. The new 2326 Dual-Attach Bracket may work, but is yet to be confirmed.


Will fit the following only with the addition of the # 2311 eoGEAR Wide Rail Adapter
(it replaces the black backplate supplied by Minoura)

  • Brooks leather (those w/o springs in the rear). An adapter is not needed for the new Brooks Cambium.
  • Rivet (all models)
  • Selle Anatomica

Carbon Rails?

We have used the Standard or Angled bracket on chromoly, alloy, ti and carbon rails without any issues. Remember, if you are worried about a 10-pound bag putting too much pressure on your carbon fiber saddle rails, then you might consider switching to chromoly, as your body weight is at least 10 to 20 times that amount. Those brackets attach in similar fashion to your seatpost as does your saddle...putting pressure on the top and bottom of the rails, but not loading from the sides.

Carbon Seatpost?

The Dual-mount bracket Velcro’s to the rails on the top and the bottom has a soft rubber fitting that is fine with round seatposts (carbon or alloy is OK).