Mavic bottom bracket, the road to perfection

Vintage Mavic bottom brackets are known to last forever thanks to a unique ‘floating’ monobloc design with sealed bearings.

At least, that’s true for the most commonly used vintage Mavic bottom bracket. But it did take Mavic a few tries before they got to their universal and indestructible bottom bracket design. Did you know that Mavic made 4 clearly different types of bottom brackets? Or even 5 types, to be correct, but I decided to combine 610 RD and 610 URD in one overview since the visual differences are minimal.

From left to right: Mavic 600, 600 RD, 610 RD/URD, 616 RD bottom brackets

1. Type 600: before 1979

This first Mavic bottom bracket already features a sealed aluminum ‘monobloc’ design with sealed bearings. The monobloc design resulted in perfectly aligned bearings for great performance and long lifespan. The advanced design would be improved and largely copied about 20 years later by other brands. Mavic’s first bracket design failed miserably though; Mavic chose a 4 pin mounting system which just wasn’t working to tightly fix the bottom bracket in place.

I date it prior to 1979 because Mavic refers to a previous model when it describes the improved 600 RD in its 1979 catalogue as: “Based on the monobloc design of the model 600 bottom bracket but with a new mechanical design”.

2. Type 600 RD, from 1979-1989

In this production version, which was about 30g heavier than the original model 600, Mavic solved the above problem by re-introducing classic features: mounting rings. Mavic kept the sealed bearings and added not one, but 2 mounting rings, one at either side of the bottom bracket. This resulted in a monobloc bracket with adaptable chain line… genius! But apart from heaving sealed bearings and a slightly adjustable chain line, Mavic still needed 3 different bottom bracket bodies for Italian, BSA and metric threaded bottom bracket boxes.

It came in 3 axle lengths: 116, 121 (triple) and 125 (long triple) mm.

The 600 RD copies features from the popular 500 RD hubs:

The RD stands for Réglable (Adjustable) – Démontable (Can be taken apart), 2 features which were copied from the popular 500 RD hub design. Due to this, the new design clearly improved over the original model 600 bottom bracket.

Excerpt from the 1979 catalogue

3. Type 610 RD (1984-1988) / URD (from 1989)

This is the most common Mavic bottom bracket around. I am not 100% sure in which year it was first introduced, but it must be around 1983-‘4.

I read once in an online review on that Mavic’s 610 bottom bracket “requires personal courage, real expertise, or professional installation, but will last you a life time.” I couldn’t phrase it any better.

The 610 bottom bracket is amongst the best bottom brackets ever made. It was not lightweight, weighing in at 285g for a 114 mm bottom bracket, but it fits any bottom bracket box whether it is Italian, English or metric. It would even fit a bracket with wasted threads thanks to its ‘universal floating’ concept.

Originally it came in 5 lengths: 112 (pista), 116, 121 (triple), 125 (long triple) and 134 (MTB) mm. The URD version, came in 110 (pista), 114, 116, 119 (triple) and 123 (long triple) mm.

Type 610 URD for Starfish cranks

The 610 URD is introduced in 1989 to fit the new Mavic 631 ‘starfish’ crankset. It is identical to the 610 bottom bracket but:

  • It has equal axle length on both sides of the sealed housing
  • It introduces plastic friction rings to tighten the chamfered mounting rings

Why does one need courage to mount a 610 bottom bracket?

To properly mount it, the bottom bracket box of the frame needs to be re-faced with a 45° chamfer to fix the chamfered mounting rings. Obviously it removes the outer few threads of the bracket which sort of eliminates mounting another type of bracket in the future. But why would you revert to a lesser bracket, right?

It is scary at first, but with the proper tools it’s a piece of cake.

A 1990 Look frame with a freshly chamfered bottom bracket box.

4. 616 RD, from 1989

This type was made especially to mount triple cranks, in particular for mountainbikes. It has all the features and advantages of the 610 URD bottom bracket, but incorporates a wider aluminium monobloc body for 124-134 mm axles resulting in improved stiffness and durability.

You can clearly spot the different mounting rings on the 610 RD (left) and the 616 RD (right) bottom bracket.

We try our best to get all details right before publishing. But if you have any questions, remarks or extra information about the above article or about other Mavic components, we kindly invite you to drop your comment below or send us an e-mail on

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  1. March 14, 2021

    do you have the dimensions for the bearings used in the Mavic BB’s? I believe Mavic used the same bearing in all their BB’c

  2. Thomas Frank
    November 9, 2020

    one question is it really necessary to us the this plasic ring with the RD 610 cardridge – within 5 of my MAVIC bikes I didn’t used them

    • Stefan
      November 10, 2020

      Hi Thomas, as you know, it worked just fine without it until 1989. As far as I understood from mechanics, it ‘felt better tightening it with the ring’ and it reduces galvanic corrosion. I can’t tell about the second part but I do agree with the first part… as an hypersensitive person, I prefer the smoother, less scratching feeling when the ring is added ;-).

  3. Louis P
    May 8, 2019

    Hi, I’m currently mounting one these beautiful 610 bottom bracket on a Gitane Time Trial frame, do you know where could I borrow the Mavic 45′ refacing tool you show in the post ? I live in France if it helps. Very good article, very well documented ! Thanks for the time you took to write it.

    • Stefan
      May 9, 2019

      Hi Louis, thank you for the kind words. You are welcome. If you can find a refacing tool anywhere in the world, France would be the place. If you are using facebook, we can suggest to pose your question in the following facebook group, I am sure someone in your region will be able to help you:
      Good luck with the project!

  4. Matteo
    February 14, 2019

    Hi do you know if it’s possible to fit campagnolo ultra torque cups on a champfered bb box like that? Thanks

    • Bart Suykerbuyk
      February 16, 2019

      If the BB hasn’t been chamfered to much (and puts your crankset out of center it should be possible. Unless the treads have somehow been damaged or so

  5. Lancelot Sanderson
    November 10, 2017

    Dear Sir/Madam,

    Wish I had another of these superb items! Currently mine is 114-mm, and I wish to find another square-axle fitted chainset………somewhere ?

    Improper, as I may desire trying my existing Super-Record chainset. Wish I’d kept my Mavic chainset!

  6. Rich Matthews
    October 13, 2017

    Great timeline I had to go to the Mavic BB as my B.B. shell had stripped threads, it complemented the rest of the Mavic group set I had on at the time and works a charm, my only gripe is that the bearings are nigh on impossible to source as they were not standard diametre, one day I’ll find a pair that are reasonably priced

    • Stefan
      October 13, 2017

      Thanks Rich. Indeed, they are hard to find. I have some original spares for myself but I’ll check with some suppliers who has good replica’s. Cheers, Stefan

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