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Shimano 31.8mm Disc Brake Caliper Fixing Bolt 74mm Caliper on Flat-Mount Frame Adaptor

Shimano 31.8mm Disc Brake Caliper Fixing Bolt 74mm Caliper on Flat-Mount Frame Adaptor

Best price now

$6.00at N+1 BikesChecked 1 h ago

Compared across 13 stores. Prices are checked against each store and labelled with when.

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Price facts

  • Best price today: $6.00 at N+1 Bikes (checked Nov 12, 2026).
  • Checked at 13 stores.

Our take on the Shimano 31.8mm Disc Brake Caliper Fixing Bolt 74mm Caliper on Flat-Mount Frame Adaptor

This is a single Shimano fixing bolt for mounting a flat-mount disc brake caliper to a frame or fork, or to a flat-mount frame adaptor. It is the 31.8mm-length bolt for 74mm caliper spacing, the standard flat-mount pattern. It is a small replacement part rather than an upgrade: buy it to replace a lost or damaged bolt, or to fit a caliper to a frame that needs the longer length. Rivals sell similar bolts in packs or as part of adaptor kits, so check the length and thread before ordering.

Best forReplacing a lost or stripped caliper boltFitting a flat-mount caliper to a frame adaptorHome mechanics keeping spare mounting hardware
Pros
  • Genuine Shimano part with consistent thread and finish
  • Correct 31.8mm length for flat-mount caliper and adaptor stacks
  • Sold as a single bolt, so you buy only what you need
  • Standard 74mm flat-mount spacing fits most road and gravel calipers
Cons
  • Sold individually, so a full caliper needs more than one
  • No washers or instructions included
  • Easy to order the wrong length without measuring first
  • Small part with little margin for a stripped thread

Shimano 31.8mm Disc Brake Caliper Fixing Bolt 74mm Caliper on Flat-Mount Frame Adaptor prices at every store

  • N+1 BikesNew

    In stock

    $6.00Checked 1 h ago
    Visit N+1 Bikes
  • Performance BicycleNew

    In stock

    $4.55+ $4.99 shippingChecked 1 h ago
    Visit Performance Bicycle
  • Modern BikeNew

    In stock

    $6.00+ $8.99 shippingChecked 1 h ago
    Visit Modern Bike
  • Newbury Park Bike ShopNew

    In stock

    $7.00+ $8.00 shippingChecked 1 h ago
    Visit Newbury Park Bike Shop
  • SX CollectiveNew

    In stock

    $5.88+ $10.00 shippingChecked 1 h ago
    Visit SX Collective
  • Colorado CyclistNew

    In stock

    $6.30+ $9.95 shippingChecked 1 h ago
    Visit Colorado Cyclist
  • Universal CyclesNew

    Availability unknown

    $6.00Checked 1 h ago
    Visit Universal Cycles
  • Pro Bike SupplyNew

    Availability unknown

    $6.00Checked 1 h ago
    Visit Pro Bike Supply
  • Sierra Bicycle SupplyNew

    Availability unknown

    $6.00Checked 1 h ago
    Visit Sierra Bicycle Supply
  • Trek Bicycle Stores of FloridaNew

    Availability unknown

    $7.00Checked 1 h ago
    Visit Trek Bicycle Stores of Florida
  • Durango BikesNew

    Availability unknown

    $7.00Checked 1 h ago
    Visit Durango Bikes
  • Tree Fort BikesNew

    Availability unknown

    $10.99Checked 1 h ago
    Visit Tree Fort Bikes
  • Worldwide CycleryNew

    Availability unknown

    $11.99Checked 1 h ago
    Visit Worldwide Cyclery

Also available at

  • Trek Bicycle Stores of FloridaCheck price at Trek Bicycle Stores of Florida

Shimano 31.8mm Disc Brake Caliper Fixing Bolt 74mm Caliper on Flat-Mount Frame Adaptor price history

Lowest price we've seen: $4.55 on Nov 12 at Performance Bicycle. Tracked across 13 stores since Nov 12.

About the Shimano 31.8mm Disc Brake Caliper Fixing Bolt 74mm Caliper on Flat-Mount Frame Adaptor

These are Shimano mounting bolts for flat-mount disc brake calipers. The name lists a 31.8mm size and a 74mm caliper-on-frame adaptor fit.

The bolts are sold individually.

Brand
Shimano
Type
Disc brake caliper fixing bolt
Mount
Flat-mount
Size
31.8mm
Adaptor fit
74mm caliper on flat-mount frame
Sold as
Individual bolts

Questions and answers

What does this bolt fit?
It is a Shimano fixing bolt for flat-mount disc brake calipers with 74mm mounting spacing. The 31.8mm length suits calipers mounted on a flat-mount frame adaptor or a thicker mounting stack.
Is one bolt enough for a caliper?
No. Flat-mount calipers typically use two bolts, and this listing is for a single bolt. Count what you need before ordering.
How do I know which length I need?
Measure the old bolt or check the frame or adaptor manufacturer's spec. A bolt that is too long can bottom out, and one that is too short will not hold the caliper safely.
Does it come with washers?
The bolt is sold on its own. Reuse the washers and spacers from your existing setup, or source them separately if they are missing.
Can I use it on any disc brake caliper?
It is intended for Shimano flat-mount calipers. Other brands may use a different thread pitch or head, so match it to your caliper.
Where is the Shimano 31.8mm Disc Brake Caliper Fixing Bolt 74mm Caliper on Flat-Mount Frame Adaptor cheapest?
At N+1 Bikes, for $6.00, as of our latest check.
Where can I buy the Shimano 31.8mm Disc Brake Caliper Fixing Bolt 74mm Caliper on Flat-Mount Frame Adaptor?
13 stores we checked sell it, including N+1 Bikes, Performance Bicycle, SX Collective, Modern Bike, Universal Cycles.

Stores we've priced the Shimano 31.8mm Disc Brake Caliper Fixing Bolt 74mm Caliper on Flat-Mount Frame Adaptor at

  • Performance Bicycle deals and prices
  • Sierra Bicycle Supply deals and prices

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