Pitstopper Allen Head Plugs

(49 customer reviews)

From: $14.99

An exceedingly simple, yet effective way to protect the ancillary components of your bike from opportunistic thieves. Protect any item on your bike that uses an allen bolt with Pitlock Pitstoppers.

Pitstoppers come in four sizes: M5, M6, M8, and M10. Each set of Pitstoppers comes complete with two Pitstoppers, and one screw.

Learn more about Pitstoppers, how to install them, and why they work by checking out our guide to Pitstoppers.

See below for additional product and sizing specifications.

SKU: PSM0521UB Category:


Pitstopper plugs appear to be cylindrical when in fact, they have an extremely minute conical shape. Push the plug a few millimeters into any allen socket of the corresponding size, tap in with a hammer, and you’re finished. Each set of Pitstoppers comes complete with two Pitstoppers, and one screw.

To remove, thread the included screw into the Pitstopper plug and tighten until the plug is popped out by the screw bottoming out in the allen head. Pitstopper use a non-standard thread and pitch, and are very difficult to remove without the screw that came with your set. Do not lose this! A detailed installation video can be found on our Pitstopper guide page.

Looking for a way to keep track of your Pitsoppers? The keychain canister is an easy way to keep from losing your Pitstopper screw, and any spare Pitstoppers you may have. Each holds 3-4 screws, or 7-10 Pitstoppers. Purchasing a canister as part of the Pitstopper set provides a 25%-off discount.


The designation of M5/M6/M8/M10 refer to the diameter of the bolt threads, not the size of the allen wrench. The wrench for any particular allen bolt is smaller than the bolt diameter.

M5 = 5mm thread diameter and uses a 4mm allen wrench
M6 = 6mm thread diameter and uses a 5mm allen wrench
M8 = 8mm thread diameter and uses a 6mm allen wrench
M10 = 10mm thread diameter and uses an 8mm allen wrench

Additional information

Pitstopper Size

M5, M6, M8, M10

49 reviews for Pitstopper Allen Head Plugs

  1. Mark W. (verified owner)

    I used this to protect Allen screws attaching my saddle to the seat post. An alternative is to find a ball bearing and glue it in place. But the glue method means you can’t adjust the Allen screw during a ride – at best you have to dissolve the glue at home. This is a simple solution, and can be used to protect other items like brakes.

  2. John M DeMarco (verified owner)

  3. Roshun (verified owner)

  4. Gilbert Mina (verified owner)

  5. John M DeMarco (verified owner)

  6. Anthony Cousins (verified owner)

    Got one for my seat clamp and one for the saddle itself. Very easy to install. I feel so much better about the security of my bike, now.

  7. Joseph (verified owner)

  8. Max White

    Easy to install. Only time will tell how well they stay in place and prevent theft. Haven’t tried removing them with screw yet but looks like they work well in theory.

  9. Lisa L. (verified owner)

    Love these plugs. Shipped quickly and with minimal packaging, thanks for thinking of the environment!

  10. Galen Fitzpatrick (verified owner)

  11. Lise (verified owner)

    They are quite expensive for 2 plugs, but I had no problem setting them in place. I tried removing them as well and it works perfectly.

  12. Anonymous (verified owner)

  13. Anonymous (verified owner)

    prompt service; utility no tested yet

  14. William (verified owner)

  15. Gilbert Mina (verified owner)

    I’m very happy with the product as well as customer received by Urban Bike Tech.

  16. Gilbert Mina (verified owner)

  17. Nick L. (verified owner)

  18. Robin Clendinnen (verified owner)

    So you guys like “brutal honesty” … how would i be able to give a review about a product i have not received? You have my address and delivery date … and yet e-mail me before i received my item both reminding me i have not received it yet … but also that i don’t know how the product functions yet … but i do know you care more about selling items to more people than you did this single transaction.

    Amazon does this too.

  19. Patrick (verified owner)

  20. Sara (verified owner)

  21. Anonymous (verified owner)

  22. Douglas (verified owner)

    I had researched these online before buying. They worked just as I had read they would. Installation was a snap. The shopping experience on Urban Bike Tech went perfectly. The parts shipped promptly.

  23. Anonymous (verified owner)

    Works as expected. Not sure how secure it is thou from attacks. Better than nothing I guess. Price seems a little high for just a little screw and 2 round nuts.

  24. James D. (verified owner)

    A very clever solution. Maybe not super elegant (requires a hammer) but seems secure.

  25. Andy L. (verified owner)

    I’ve got these on both bikes now- nice peace of mind and great service too.

  26. David (verified owner)

    Everything in the order is great. Customer service and communication was perfect. Most companies that I have dealt with, could benefit from a lesson in customer service from Urban Bike Tech. Thanks!!!

  27. andre dupre (verified owner)

    Clever product for adding an extra layer of security. I have them on all my Brooks saddles. Urban bike tech gets it out quick every time. Longtime happy customer.

  28. David F. (verified owner)

  29. Hal (verified owner)

    Just received and installed on my seat bracket. Easy and inexpensive protection.

  30. Anonymous (verified owner)

  31. Anonymous (verified owner)

  32. Anonymous (verified owner)

    Perfect for deterring NYC thieves from all the little components- saddle, pedals, handlebars

  33. Anonymous (verified owner)

  34. Carlos B. (verified owner)

  35. Anonymous (verified owner)

    haven’t installed yet!

  36. Andre (verified owner)

    Elegant solution to protect my expensive saddle

  37. Anonymous (verified owner)

    So far so good – easy to install. Seems like a good deterrent.

  38. Mark (verified owner)

  39. Candice (verified owner)

    Haven’t had time to install them on our bikes yet, but they arrived quickly! my friend’s really happy with his gift and I found UrbanBikeTech very helpful and pleasant regarding questions I had about the order and refunding part of the shipping cost. Thanks!

  40. Anonymous (verified owner)

    pack of two of the same size is not very efficient. I needed two of different sizes but I had to pick one, get two of that, and have no use for the extra.

  41. Nicolas H. (verified owner)

    Love the pitstoppers. Will slow down someone determined but will completely confuse occasional thief.

  42. Anonymous (verified owner)

    A good theft deterrent. A bit pricey for what you get though.

  43. Anonymous (verified owner)

  44. Philip (verified owner)

    The product was good but I plan not to order from this shop again due to too many marketing emails.

  45. adel ahmed (verified owner)

    They are great products and they have prompt and helpful customer service. Provided these are installed correctly, these pitstoppers would be a great theft deterrent as it would take the thief too long to remove these without damage to the component they want to steal or would take too long. These are also very reasonably priced.

    As for customer service, I had trouble with one order where one of the pitstoppers came with only 1 insert instead of the typical 2. When I ordered more pitstoppers, I wrote in the notes that this was the case, they apologized and sent me another pair of pitstoppers on top of the one I ordered. I didnt expect this courtesy, but I am certainly thankful for it!

  46. Anonymous (verified owner)

  47. Nicholas (verified owner)

    These seem like an effective and inexpensive theft deterrent to the casual thief.

  48. Michael N. (verified owner)

    Fantastic customer service at Urban Bike Tech! Great communication… quick shipping… Just as described!

  49. James M Knock (verified owner)

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