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    Derailleurs

    XTR M9250 Rear Derailleur
    XTR M9250 Rear Derailleur
    Shimano
    $665.00
    Save 16%
    SRAM XX SL Transmission AXS Rear Derailleur Cage Assembly Kit - Thunder Mountain Bikes
    XX SL Transmission AXS Rear Derailleur Cage Assembly Kit
    SRAM
    $230.00 $193.20
    RD-M8250 Rear Derailleur Plate Assembly
    RD-M8250 Rear Derailleur Plate Assembly
    Shimano
    $85.00
    Save 16%
    SRAM X0 Transmission AXS Rear Derailleur Full Mount Bolt Kit - Thunder Mountain Bikes
    X0 Transmission AXS Rear Derailleur Full Mount Bolt Kit
    SRAM
    $35.00 $29.40
    XTR RD-M9250 Rear Derailleur Plate Assembly
    XTR RD-M9250 Rear Derailleur Plate Assembly
    Shimano
    $155.00
    Save 20%
    GX Transmission Eagle AXS Upgrade Kit
    SRAM
    $605.00 $484.00
    Save 16%
    SRAM XX Transmission AXS Rear Derailleur Pulley Kit - Thunder Mountain Bikes
    SRAM XX Transmission AXS Rear Derailleur Pulley Kit - Thunder Mountain Bikes
    XX Transmission AXS Rear Derailleur Pulley Kit
    SRAM
    $90.00 $75.60
    Save 16%
    SRAM XX SL Transmission AXS Rear Derailleur Full Mount Bolt Kit - Thunder Mountain Bikes
    XX SL Transmission AXS Rear Derailleur Full Mount Bolt Kit
    SRAM
    $35.00 $29.40
    Save 16%
    SRAM Transmission AXS Rear Derailleur Set Up Key / Cage Lock - Thunder Mountain Bikes
    SRAM Transmission AXS Rear Derailleur Set Up Key / Cage Lock - Thunder Mountain Bikes
    Transmission AXS Rear Derailleur Set Up Key / Cage Lock
    SRAM
    $17.00 $14.28
    Deore XT M8250 Rear Derailleur
    Deore XT M8250 Rear Derailleur
    Shimano
    $570.00
    Save 16%
    Eagle 90/70 T-Type Rear Derailleur Pulley Kit
    SRAM
    $20.00 $16.80
    Save 16%
    SRAM XX Transmission AXS Rear Derailleur Cover Kit - Thunder Mountain Bikes
    SRAM XX Transmission AXS Rear Derailleur Cover Kit - Thunder Mountain Bikes
    XX Transmission AXS Rear Derailleur Cover Kit
    SRAM
    $25.00 $21.00
    Save 16%
    SRAM XX SL / XX / X0 Transmission AXS Rear Derailleur Inner Cage - Thunder Mountain Bikes
    SRAM XX SL / XX / X0 Transmission AXS Rear Derailleur Inner Cage - Thunder Mountain Bikes
    XX SL / XX / X0 Transmission AXS Rear Derailleur Inner Cage
    SRAM
    $40.00 $33.60
    S100 Eagle Rear Derailleur
    S100 Eagle Rear Derailleur
    SRAM
    $70.00
    S500 Eagle AXS Rear Derailleur
    S500 Eagle AXS Rear Derailleur
    SRAM
    $390.00
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    Altus RD-M310 Rear Derailleur
    Altus RD-M310 Rear Derailleur
    Shimano
    $31.00 from $26.04
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    AXS Rear Derailleur Cover Kit Clutch
    AXS Rear Derailleur Cover Kit Clutch
    SRAM
    $15.00 from $14.28
    Save 16%
    SRAM X0 Transmission AXS Rear Derailleur Set Up Key / Cage Lock - Thunder Mountain Bikes
    SRAM X0 Transmission AXS Rear Derailleur Set Up Key / Cage Lock - Thunder Mountain Bikes
    X0 Transmission AXS Rear Derailleur Set Up Key / Cage Lock
    SRAM
    $17.00 $14.28
    Save 16%
    SRAM XX Transmission AXS Rear Derailleur Full Mount Bolt Kit - Thunder Mountain Bikes
    XX Transmission AXS Rear Derailleur Full Mount Bolt Kit
    SRAM
    $35.00 $29.40
    Sold Out
    XTR RD-M9250 Rear Derailleur Cable Cover and Fixing Screw
    Shimano
    $15.00

    Let customers speak for us

    from 3790 reviews
    It is working very

    It is working very well!

    Terry T.
    Hydraulics Reservoir
    Oval Chainring

    Awesome parts, the oval chainring helps with climbing effort and cadence.
    Thunder mountain delivered super fast, great bike shop. Thanks!

    Andrew K.
    SRAM 3-Bolt Oval Chainring
    love the color

    love the color AND the grip

    Anonymous
    Aluminum Flat Pedal
    Great price and shipping

    Great price and shipping. Better than Amazon. Loving the improved ground clearance on the enduro bike

    Zac P.
    GX Eagle DUB Crankset
    Game changer

    Game changer !!!

    Brian S.
    Fatbar V3 Handlebar

    Only crank boots that work and last on Shimano cranks. Never ride without them!

    R.A.W.
    Shimano Crank Arm Protector Boots

    A better version of the stock UDH, appreciate the accent color to match my bike

    R.A.W.
    Universal Derailleur Hanger (UDH)

    Vast improvement in feel, stopping power & longevity compared to stock. Nothing but MTX on my XT's!

    R.A.W.
    Red Label Race Brake Pads - Shimano/TRP 4-Piston

    Awesome grips, nothing comes close in comfort, size and durability

    R.A.W.
    Megattack Grips

    Chrome makes you faster!

    R.A.W.
    Handlebar Decal Kit

    The new V2 bars are noticeably improved which i thought could not be possible!

    R.A.W.
    Carbon V2 35mm Handlebar
    No issues with fit or alignment

    No issues with fit or alignment. Runs smooth.

    Anonymous
    SRAM Direct Mount Chainring
    Great chainring and outstanding quality

    Great chainring and outstanding quality.

    Jose R.
    SLX M7100 (SM-CRM75) Chainring
    Lever's great, but TM Bikes is even better.

    Brake lever is perfect and simple to install. But more importantly, Thunder Mountain Bikes delivered quickly with reliable tracking. Would shop here again.

    Eric B.
    Deore XT BL-M8100 Brake Lever Blade
    Mullet gravel

    Replaced my 11-42 cassette to complete my mullet gravel drivetrain conversion on my Salsa Cutthroat.

    TERRANCE Z.
    Deore CS-M5100 Cassette
    2552
    78