Product Description
Robert Axle Project axles are specifically engineered to attach BOB Yak and Ibex trailers to your thru axle equipped bike. Machined and tested in the USA, the BOB Trailer axles are designed for maximum strength and ease of use.
Use the tools below to select the proper axle for your bike.
Select axle size above to view price & availability. Description is axle length(s) x thread pitch.
Axle Fit Guide
Most axles supplied on your bike now come with the length (L) and thread pitch (TP) measurements printed on the axle. Remove the axle from your bike and check for printed dimensions. If you find printed specs on the axle, simply measure the axle length to determine if length (L) is hub length or actual bolt length.
Note: Axle length is not the same as hub length. A bike with a 12×142 hub standard will have a significantly longer axle.
Download the Axle Fit Guide by clicking the image below.
- Download & print the pdf (actual size - DO NOT SCALE), and verify the accuracy of the scale with a ruler.
- Determine your axle thread pitch by holding up the threads on your axle to the examples.
- Determine the approximate overall length of your axle by holding it up to the examples.
- The printable fit guide (click image above) is the best way to determine the axle you need.
- Axle Length refers to the length of the axle shaft. All axles are compatible within +/- 2mm.
- Axles that fit more than one length use spacers. Only 1.0 mm Thread Pitch axles come with X-12 spacer.
- Axles do not come with the BOB Trailer bobbins. Those are available separately, here. Or they can be re-purposed from the stock BOB Trailer Quick Release that came with your trailer.
** Lesser dimension is axle shaft measured with the included tapered X-12 spacer. Greater dimension is axle shaft measured without spacer. Only 1.0 mm Thread Pitch axles come with X-12 spacer.
Use the videos (above Product Video tab) to learn more about Robert Axle Project, including how to determine what axle you need and how to install with a BOB Trailer.
See also Robert Axle Project Bobbins for BOB Trailers
Thru-Axle Finder Tool - Input Your Bike Info to Get SKU#
Dimensions & Specifications with SKU/Part# (BOBxxx):
Robert Axle Project BOB Trailer 12mm Thru Axle, Length: 152 or 167mm Thread: 1.0mm
SKU/Part# BOB117
Dimensions:
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The true length of this axle shaft is 167mm long. This axle comes with a flat and a tapered (X-12) spacer. So this axle can be 167, 160, or 153mm long depending on spacers used.
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Thread Pitch: 1.0mm
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Compatible with Syntace 12x135 and 12x142 axles as well as other manufacturers with similar dimensions.
Robert Axle Project BOB Trailer 12mm Thru Axle, Length: 160, 167 or 172mm Thread: 1.0mm
SKU/Part# BOB113
Dimensions:
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The true length of this axle shaft is 172mm long. This axle comes with a flat and a tapered (X-12) spacer. So this axle can be 172, 167 or 160mm long depending on spacers used.
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Thread Pitch: 1.0mm
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Compatible with Syntace 12x142 and 12x148 axles as well as other manufacturers with similar dimensions.
Robert Axle Project BOB Trailer 12mm Thru Axle, Length: 169, 175 or 184mm Thread: 1.0mm
SKU/Part# BOB126
Dimensions:
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The true length of this axle shaft is 184mm long. Spacers included for a 169, 175, or 184 mm fitment. So this axle can be 169, 175 or 184mm long depending on spacers used.
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Thread Pitch: 1.0mm
- We suggest a +/- 2mm axle length fit is perfect for all our axles.
Robert Axle Project BOB Trailer 12mm Thru Axle, Length: 217 or 229mm Thread: 1.0mm
SKU/Part# BOB115
Dimensions:
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The true length of this axle shaft is 229mm long. This axle comes with a tapered (X-12) spacer. So this axle can be 229 or 217mm depending on spacers used.
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Thread Pitch: 1.0mm
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Compatible with Syntace 12x197 axles as well as other manufacturers with similar dimensions.
Robert Axle Project BOB Trailer 12mm Thru Axle, Length: 159 or 165mm Thread: 1.5mm
SKU/Part# BOB112
Dimensions:
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The true length of this axle shaft is 165mm long. This axle comes with a 6mm flat spacer. So this axle can be 165 or 159mm long depending if the spacer is used.
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Thread Pitch: 1.5mm
Robert Axle Project BOB Trailer 12mm Thru Axle, Length: 172 or 178mm Thread: 1.5mm
SKU/Part# BOB114
Dimensions:
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The true length of this axle shaft is 178mm long. This axle comes with a 6mm flat spacer. So this axle can be 172 or 178mm long depending if the spacer is used.
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Thread Pitch: 1.5mm
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This axle is compatible with Shimano 12x142 or 12x148 E-thru and other axles with the same dimensions.
Robert Axle Project BOB Trailer 12mm Thru Axle, Length: 209mm Thread: 1.5mm
SKU/Part# BOB106
Dimensions:
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The true length of this axle shaft is 209mm long.
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Thread Pitch: 1.5mm
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This axle is compatible with 12x177 hub standards depending on the specific dimensions of the stock axle.
Robert Axle Project BOB Trailer 12mm Thru Axle, Length: 217 or 229mm Thread: 1.5mm
SKU/Part# BOB108
Dimensions:
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The true length of this axle shaft is 229mm long.
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Thread Pitch: 1.5mm
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Compatible with 12x197 hub standards depending on the dimensions of the stock axle.
Robert Axle Project BOB Trailer 12mm Thru Axle, Length: 167mm Thread: 1.75mm
SKU/Part# BOB121
Dimensions:
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The true length of this axle shaft is 167mm long.
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Thread Pitch: 1.75mm
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Compatible with 12x135 or 12x142 hub standards depending on the dimensions of the stock axle.
Robert Axle Project BOB Trailer 12mm Thru Axle, Length: 174 or 180mm Thread: 1.75mm
SKU/Part# BOB111
Dimensions:
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The true length of this axle shaft is 180mm long. This axle comes with a 6mm flat spacer. So this axle can be 174 or 180mm long depending if the spacer is used.
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Thread Pitch: 1.75mm
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This axle is compatible with Maxle 12x142 or 12x148 and other axles with the same dimensions.
Robert Axle Project BOB Trailer 12mm Thru Axle, Length: 192 or 198mm Thread: 1.75mm
SKU/Part# BOB110
Dimensions:
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The true length of this axle shaft is 198mm long. This axle comes with a 6mm flat spacer. So this axle can be 192 or 198mm long depending if the spacer is used.
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Thread Pitch: 1.75mm
Robert Axle Project BOB Trailer 12mm Thru Axle, Length: 209mm Thread: 1.75mm
SKU/Part# BOB109
Dimensions:
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The true length of this axle shaft is 209mm long.
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Thread Pitch: 1.75mm
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This axle is compatible with 12x177 hub standards depending on the specific dimensions of the stock axle.
Robert Axle Project BOB Trailer 12mm Thru Axle, Length: 217 or 229mm Thread: 1.75mm
SKU/Part# BOB107
Dimensions:
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The true length of this axle shaft is 229mm long. This axle comes with a flat 12mm spacer. So this axle can be 229 or 217mm depending on spacers used.
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Thread Pitch: 1.75mm
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This axle is compatible with 12x197 hub standards depending on the specific dimensions of the stock axle.
Product Videos
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Custom Field
Product Reviews
10 Reviews Hide Reviews Show Reviews
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Perfect
It looks high quality and was easy to install. I haven't ridden with it yet but it does exactly what the quick-release on my old bike did. Fairly priced!
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Axle and bobbins
Great fit, works perfectly on my fat tire and 29er
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Circumference of bolt on one side
My only issue was the attachment site on one side of thru axle to Bob Trailer. The circumference of axle is too small. I had to use duct tape to expand so the hitch didn’t move around and rattle.
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Thru axle for BOB trailers
I purchases this for use on my Trek Checkpoint, instructions were clear and installation was simple. Works great and will be using it for an upcoming bikepacking trip.
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Finally I can pull my BOB trailer
It works nicely. However, the extra washer that's provided isn't a great fit - the I.D. is too large (sloppy fit), and the O.D. is larger than the thru-axle head and it doesn't fit flush on the frame. Would have been nice to have a machined washer with I.D. that fits snugly on the thru-axle and O.D. that matches the diameter of the thru-axle head.
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Perfect
Excellent service and excellent product
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Axle for bike to attached Bob cargo-trailer
Although the axle I ordered looks superbly made, it is the wrong one for my bike. The instructions that came with my Bob Cargobike trailer and with the Robert Axle Project website were almost exclusively focused on these solid axle types which accommodate bike frame drop-outs with threads in them. It was extremely confusing to ultimately figure out on my own (after I ordered, paid for and received) the axle that what I need is a Bob 145 QR unit. I'm clearly not an expert in this area. But this whole exercise has cost me an extra $100 (with shipping) and delayed my use of a new Cdn$850 trailer that continues to be hung up in my garage, because I can't use it. It's been extremely frustrating!!!! Hi Tim, For future reference and others, we are here to help get it right the first time. Use our toll free phone number or Contact Us form for assistance.
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Very satisfied with the product
Excellent product. Very disappointed with the delivery cost. I was charged for the delivery directly with the purchase (11.64 USD) and was surprised to have to pay an extra 11.65 $CAN as a COD charge. It seems to me that I was charged twice for the delivery cost. Response: Sorry for any inconvenience. This is posted on our website: Duties, import taxes, and/or brokerage fees, if they apply, are the sole responsibility of the recipient. Check with your country's customs agency to determine if any additional charges may incur.
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Thru-axle for BOB trailer.
The axle is well made and seems comparable in quality to the original equipment thru-axle that came with my bike. I have installed it and attached the trailer and see no reason it should not function in every way like the original QR hitch. It is unfortunate that the first review for this product shows as only 1 star, because if you read it to the end you will find the customer was actually well pleased with the product. Shipping to New Zealand took forever and the poor review was posted before the axle even arrived. The instructions for installing the thru-axle are similar. They are clear and progress logically, but the last paragraphs were written by the lawyers. Read those first and then decide how you want to proceed. The only down side I see to this axle is that if you need to remove the rear wheel of your bike on the road or trail, it will be a bit more complicated. That's a fair trade to be able to use the BOB, though.
