Thunder Bolt-On Rear Axle – 12mm x 229mm x 1.5 Thread

(3 customer reviews)

$ 57.00

Designed for big rides and big riders. Our Thunder Bolt-On replacement thru-axles are a strong and durable option to replace your stock through axle. Thunder Bolt-On Axles are NOT for use with a trailer, but are a solid option if you’re looking to replace your stock thru axle with a more durable, lower profile design. If you want a lighter weight axle, then check out our Lightning Bolt-On Axles.

This is NOT an axle for attaching trailers or trainers.

In stock

Get 20% Off Lightning Bolt-on Axles With Purchase of Any Trailer or Trainer Axle! Discount Automatically Applied.
SKU: BOL208 Category:


If you’re tired of having a thru axle that sticks out far past your hub, but you’re skeptical of ultra-lightweight parts, then the Thunder Bolt-On Axle may be for you. Simple, clean, and very strong, these bolt-on thru axles are a perfect alternative to your stock thru axle. Easy to install and remove, too!

If you want a lighter weight axle, then check out our Lightning Bolt-On Axles.

Prop65 Warning icon

WARNING: This product can expose you to chemicals including nickel acetate, which is known to the State of California to cause cancer. For more information, go to

Additional information

Weight 0.3125 lbs


Thunder Bolt-On Axles replace your stock thru axle on your 12 mm thru-axle equipped bike.

  • The diameter of this axle is 12 mm and the true length of the axle shaft is 229 mm. Please note: Thru-axle lengths do not equal hub standards. An axle has to be longer than the hub to fit in the frame. A 12×197 hub does not equal a 197 mm long axle.
  • This axle has a 1.5 mm thread pitch.
  • Weight: TBD
  • The axle is precision CNC machined in the USA from 7075 aluminum and hard anodized for rugged durability. Our axles are built to the tightest standards in the industry.
  • No special tools required. Design allows for installation or wheel removal using your standard 5 mm hex wrench.
  • Designed, built and quality tested in the USA. Proven around the world.


Need more information about how our axles work?

3 reviews for Thunder Bolt-On Rear Axle – 12mm x 229mm x 1.5 Thread

  1. Nealio (verified owner)

    I’m a big guy (255 lbs) and I like to hit medium sized (25 foot) jumps with my fatbike. I was concerned the Maxle Ultimate that came on it wasn’t made for that kind of use. Also I felt like the rear end had a weird flex sometimes.
    I needed a beefier axle and this Thunder axle looked like what I needed. I was a little concerned with the weight, but honestly I can’t tell the difference between the Thunder and the Maxle Ultimate when I hold them in my hand. However I can tell that the Thunder axle is MUCH stronger and better suited for what I need. I’ve been riding it a month and a half and I never feel that weird flex from the rear. Plus I don’t worry about breaking axles when I’m sending it.

  2. Darren Lee (verified owner)

    The thru-axle performs exactly like it should – flawlessly.
    I’m more impressed with this companies service. I incorrectly ordered the wrong thread pitch (you know, measure once and then just keep cutting…). They easily and quickly refunded me and their communication was always spot on. I would highly recommend this company!

  3. Pete (verified owner)

    Living in New Zealand,riding a fat bike with a 197 spacing,and snapping a derailleur hanger whilst Covid 19 does its thing made it impossible to find anything local in our very small market. I stumbled upon the Thunder Bolt on axle after looking for hours on-line,and basically bought 2 out of frustration.
    Well boys and girls,long story short,sometimes fairy tales do come true.
    The axles are phenomenally well made,and I have to say,give a sense of pride in the after-market add-ons you can put on your bike
    Aside from the product,freight was very reasonable if not slightly delayed,as everything seems to be lately.
    The most impressive thing for me however was the speed with which The Robert Axle Project dealt with payment and then sending my parcel(all done the same day).

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