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Replacement EPDM Bands for Garmin Quarter Turn Bike Mount

New Garmin cycling GPSs (such as the Edge 500 and Edge 800) use a new style of mount that can only be affixed to bikes with an elastic band mounting system. This Quarter Turn Bike Mount (Part Number: 010-11430-00) comes with EPDM bands for this mounting, and documentation (seen above) strongly suggests that the same sort of replacement band be used. This is a valid recommendation as EPDM is a very good material for long-term exposure to the elements, but it’s not always that easy to find a specialized material like this.

While Garmin sells the Bike Mount Elastic Bands (Part Number: 010-11430-01) set (six bands, three of each size) themselves for US$5.99, it’s possible to buy them from an industrial supply shop like McMaster-Carr for quite a bit less. Specifically, these rings appear to be as follows:

Small Garmin Elastic Band
AS568A Dash No.: -125
Width: 3/32″ (.103″ Actual)
Inner Diameter: 1 5/16″ (1.299″ Actual)
Outer Diameter: 1 1/2″ (1.505″ Actual)
McMaster-Carr Part Number: 9557K158
Price (as of 2011-Aug-03): US$9.12 for 50 Pieces

Large Garmin Elastic Band
AS568A Dash No.: -131
Width: 3/32″ (.103″ Actual)
Inner Diameter: 1 11/16″ (1.674″ Actual)
Outer Diameter: 1 7/8″ (1.880″ Actual)
McMaster-Carr Part Number: 9557K165
Price (as of 2011-Aug-03): US$9.62 for 50 Pieces

While a pack of 50 bands is overkill for most people’s needs, the price of ~20¢/ea is considerably better than Garmin’s ~$1/ea. At that price a group of friends, a team, or a shop could go in on a box of replacements and just keep them sitting around for use as needed. It also would be trivial to order smaller or larger bands if one needs the mount to fit larger or smaller surfaces; just be sure to get the 3/32″ (.103″ actual) bands and order whatever diameter desired.

2 Comments

  1. Trevor Hughes
    Trevor Hughes December 6, 2012

    Any idea how much stretch to account for when buying largers bands. In particular I’m looking for a band that will go around a water bottle installed in a torpedo mount (between aerobars on tri bike). See the photo (linked below) of how Mirinda Carfrae has her bike setup.

    I’m looking to do something similar, but wasn’t sure how much stretch to anticipate. My starting point is 2.875″ diameter of a water bottle.

    http://www.tririg.com/galleries.php?id=2012_10_Rinny_Carfrae_Felt_DA&num=3

  2. c0nsumer
    c0nsumer December 6, 2012

    Trevor Hughes: I don’t, but here’s an idea. The small elastic band will have an inner circumference of ~4.07886″ and the larger ~5.25636″. (This is based on diameter * 3.14.)

    Presuming the smaller one is for 1″ (25.4 mm) bars and the larger for 1 1/8″ bars (31.6 mm), which have circumferences of ~3.14″ and ~4.71″ respectively, this shows the bands as being ~129.9% and ~111.6% of their target bars, respectively.

    Therefore, given a 2.875″ water bottle diameter, with ~9.0275″ diameter I’d then look for a band that is about 120% of that, or with a 10.883″ circumference, or 3.45″ inner diameter.

    (Note that’s just some off the top of my head calculations scaling things up based on an estimate of stretch, but I’d give it a go.)

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