Marin Recalls 20 Models Due to Bottom Bracket Faults

Aug 19, 2021
by James Smurthwaite  

Marin is recalling 20 hardtail models sold between August 2020 and April 2021 due to bottom bracket issues.

The recall includes models of the San Quentin, Wildcat Trail, Fairfax, Terra Linda, Presideo, Kentfield, Larkspur, Muirwoods, San Anselmo, Rafael, Hidden Canyon and Bayview Trail that are fitted with bottom brackets with a black surface finish, the full list of specific models and serial number checker can be found, here.

The bikes have been recalled due to a bottom bracket fault that can cause it to break during use. The fault can cause a rider to lose control, posing fall and crash hazards to the user.

As of July 22, 2021, the company has received 6 reports of brackets breaking in Canada, 9 in the United States and 6 in the UK. So far, 1 minor injury has been reported due to the fault. Marin reports that 875 units of the affected product were sold in Canada and 2,113 were sold in the United States but figures are not currently available for bikes sold in the UK or EU.

Anyone riding one of the affected models is advised to immediately stop using the recalled bicycle and contact Marin Mountain Bikes to confirm whether their bicycle is affected. Marin will provide a free replacement bottom bracket that will be replaced by an authorized Marin retailer. No other part of the bike is affected.

Posted In:
Industry News


  • 160 4
 It's a ploy to repo the bikes and re-sell them at inflated supply-chain-is-fubared prices. Well played, Marin.
  • 8 64
flag imnotdanny (Aug 19, 2021 at 9:08) (Below Threshold)
 They are replacing a BB for free, not buying back the bikes...
  • 54 2
 @imnotdanny: whooosh
  • 9 1
 @imnotdanny: Hook line........
  • 8 1
 @MattP76: no, those are cheap Diamondback hardtails… Wink
  • 10 0
 @imnotdanny: don’t come here with such wild facts. This is not what the people want!!!
  • 33 2
 It seems like the bottom has fallen out for them.
  • 5 6
 It's like all models within the brackets have the same issue.
  • 17 1
 Hopefully it doesn't have a bearing on their bottom line.
  • 14 1
 Hopefully they can get this sealed off before they have to shell out too much.
  • 2 2
 I like the bottom , show me more
  • 18 0
 at least it is the bottom bracket itself and not the shell.. if the frames were breaking, that would be a nightmare
  • 11 14
 To be fair if the frames were breaking you might actually be able to go ahead and get a better bike
  • 4 2
 @browner: i don't think they'd be swapping out cheap hardtails for higher end bikes and people buying those hardtails probably don't have the budget for a mint build or else they would have gone that way in the first place.
  • 2 1
 @twonsarelli: nah man HT's are where it's at aye!
  • 9 0
 what exactly is breaking?
  • 4 1
 Probably the spindle
  • 26 1
 According to the Collins disctionary, it's the change of a vowel into a diphthong.
  • 4 0
 @MmmBones: The spindle is part of the crank I thought.
Edit - nevermind, just saw it's a square taper which makes sense.
  • 1 15
flag conoat (Aug 19, 2021 at 9:57) (Below Threshold)
 @MmmBones: a Bottom bracket has no spindle!? a BB is just the bearings that sit between the crank assembly(that does have a spindle) and the frame.
  • 2 0
 It's the spindle. We had 1 on a San Quentin 1 we sold fail.
  • 11 3
 @conoat: how old are you like twelve? You could learn a lot more about bikes before commenting. Many bottom brackets have a built in spindle.
  • 1 0
  • 2 0
 @conoat: Square tapper. Octalink. These the spindle makes part of the bottom bracket. E thirteen has the spindle as a separated part. Since they said the BB is failing, the bearings could be getting out of the races and the crank becoming terrifyingly wobbly.
  • 3 5
 @Bentonvillebicycleco: just leave it to a shop in the falsely proclaimed mtn bike Capitol to sell crap marins named after another falsely proclaimed mtn bike Capitol where you get tickets on a trail for going too fast
  • 6 2
 C'mon Marin, that s a bad joke. Bought a San Quentin last summer and the nightmare started. Replaced the BB three times and thought it was me... One f*ckin year later you come around with this.
Thanks to my local bike shop for fixing this shit.
  • 17 0
 So you had the BB replaced by the exact same product when it keeps breaking over and over. Well I would not thank that bike shop…
  • 1 0
 @Macmacmac: exactly. Why wouldn't he replace with an upgrade BB? A $25-$40 Shimano brand is almost bullet proof and cheap
  • 2 0
 Doesn't pretty much any bike from any manufacturer have a 1-year warranty (at least) on everything? I wouldn't be paying to replace defective parts on a new bike.
  • 5 2
 It looks like the bikes listed use lower cost square taper bottom brackets. I do remember folks breaking square taper axles way back when I first started riding. I have not had a square taper bottom bracket in a long time. Modern axels have much better geometry with larger diameters which likely makes them much less likely to fail.
  • 4 0
 There are lots of bikes still using them. Even bikes that cost $2000.
  • 28 0
 The retro grouches still like square tapers... I hated those things, as a rider and a mechanic. BB standard complaints are well deserved, but lots of riders have never had to deal with a square taper BB and are better for it.
  • 16 2

Square taper's bad reputation comes from cranks that were not torqued to spec in the first place, then came loose, had the interface destroyed by riding loose, which led to people over tightening the cranks onto the spindle which eventually cracks the aluminum cranks as they get pulled further up the taper.


Use shimano square taper bbs and follow the dealer manual for installation:
-BB into frame torque 50-70 N*m
-Lightly grease spindle interface to prevent galling
-Crank torque 35-50 N*m
-Take cranks off seasonally to clean/inspect and reinstall to torque

Shimano square taper bbs last a long time and require next to no maintenance.
  • 9 1
Could you please say "Square taper bottom bracket" a few more times?
  • 5 2
 Square taper cartridge is quite possibly the best BB design on the market, even potentially better than shimano BSA. Generally the bearings will last for years, cheap af and when they do start to develop play you still get another year out of it before it starts to become an issue
  • 11 2
 @nedD: Counterpoint: Square Taper's bad reputation comes from the fact that they suck. They're heavy, the interface is inherently fussy to install, they're flexy, and I've seen more failures of square taper spindles than any other bottom bracket type (and I'm talking failures of the actual spindle, not the crank arm).
  • 13 0
 @oscartheballer: square taper bottom bracket a few more times.
  • 5 0
 They might be a bit heavy, and can get stuck on, or wobbly if loose. But the bearings in those things last so much longer than more modern BBs. Like, forever...
  • 6 0
Yep, riding 12000km with retro brackets vs 3-4000 km with hollowtech is unmistakable proof that modern brackets bearings and/or seals are shit, regardless of road or mtb groupset, or entrance vd high end groups.

Weight and fewer necessary different widths are the sole advantages
  • 5 0
 Not if your hucking to flat, then they just snap. Lot of bad things with the square taper BB. Cheaper bike= new rider= experimenting with hucking+ cases the landing = snap. @nedD:
  • 1 6
flag nedD (Aug 19, 2021 at 13:00) (Below Threshold)
 @robway: If you're hucking to flat on any bike you can hardly blame the parts when they fail.
  • 2 0
 @Glenngineer: had to replace the damn square taper bb once a month in the mid 90ies. luckily they were cheap to replace. the skf ones were only 17 bucks or something like that. practicing trials riding was not helping with longevity. glad shimano came out with hollowtech.
  • 4 0
 @Wheeeliemann: And my V-brakes took a lot less maintenance than any of my modern disc brakes. That doesn't mean I miss them.
  • 2 0
 @Glenngineer: the initial generation of shimano cartridge BBs in the early 1990s did indeed suck, draggy and the bearings wore out in no time, but subsequent generations of Shimano improved a lot.

The real retro-grouches like square taper BBs with loose bearings and cups that thread directly into the frame. Installed correctly on a properly faced frame, those last forever in road and touring applications - I had the same one (bearings and all) on my 1990 Raleigh technium from new until 2013, and it was still smooth and spun forever when I replaced it. This bike has been my tourer and daily commuter and would have done well over 25000 km in that time. They don't fare that well on MTBs because the bearings are inherently not as well sealed, and once crud gets in it grinds the bearings, and the races and axles get pitted. Plus obviously the axle/crank interface is smaller, so it's more likely to get damaged by hard landings, particularly if not installed to spec.
  • 2 0
 Sadly news like this is what the future will look like after shimano discontinued the BB-UN55
  • 6 0
 PB needs a Breaking News headline for bikes and humans.
  • 5 0
 Hopefully cranking out some replacements is a snap for them since these are bottom bracket tier bikes.
  • 2 0
 Hey, there is a lot of winners there.
Do you know any big brand who didn't go for a recall? It's often the case when you sell hundred thousand bikes, especially in the covid period, where nothing is simple. The BB issue is not a drama, and a recall is always a strong message to show that the brand assure a good service and assume his production and, perhaps, his errors.
  • 4 1
 Can we at least know what the bb was? is it Shimano, house branded or Scam?
The Fairfax 1 has a square taper lock bb I have not seen one in over a decade.
  • 4 0
 It is just an off brand China model.
  • 1 0
 And yet another example of cheaping out initially costing more money/time in the long run.

I bought a Marin in 2017/18 when they were getting all the hype with the hawk hill. I had to strip that entire bike down and redo everything. Nothing was greased, like at all... bone dry. Brand new bike with a corroded bottom headset cup bearing. New frame Bearings needed to be pressed in, some wouldn't even spin. All the bolts had to be removed and installed to torque spec, they were all over tightened. Bolts that were supposed to be torqued to 12nm were bending my hex keys trying to get them out and making loud popping noise, as if they had snapped, when they broke free. Luckily none broke. Derailleur hanger wouldn't stay tight and constantly through the shifting out of wack. Was a nightmare.

This doesn't surprise me at all. I won't ever purchase another Marin Bike again.

Marin's response to my problems was take it back to where I bought it (which was over an hour away) and get the same people who didn't bother checking the bike over at all to redo all the things they should have done in the first place. I opted to do it myself. They wouldn't even send me dropper post grommets...

I've made a lot of stupid purchasing decisions in my day, from a fat bike to a $1500 carbon fiber backpack, Marin is near the top of that list as far as wasting money.
  • 1 0
 just bought a frame and had all the exact same issues, cannot remove any of the 6mm bolts even with a large hex. just wow
  • 3 0
 What bottom bracket is being used that would fail affecting basically every model? Have to imagine other mfrs impacted too.
  • 5 0
 Probably some super cheap square tapered cartridge BB as these appear to all be entry level hard tails. Likely installed on other budget bike brands as well.
  • 3 0
 @chacou: yeah I realized that was a dumb comment immediately after posting. But now that I'm actually awake I can only think of how many of these bikes won't go back for service if buyers at this level don't know what a bottom bracket is/does.
  • 1 0
 i just googled them all even the trail bike for a grande uses a "Sealed Cartridge Bearings, Square Taper" as listed in spec pages.... again I used one in 2002 on my Santa Cruz Superlight and the creaking sucked the bag
  • 1 0
 Dodged that bullet. New lockdown in New Zealand - family rides are the best. My son's San Quentin 24 bought 2 months ago has a different BB. Sick bike with great gear range, decent brakes and tunable fork for his mass.
  • 2 0
 I'm imagining some guy sitting there heat-treating the bb axle with a cigarette lighter.
  • 2 0
 Has anyone over 40 NOT snapped a square taper BB axle? It was pretty normal BITD!
  • 1 0
 Yeah and having them work loose each ride no matter how much you torqued it!
A lot of tech gets a lot of hype (droppers etc) but if you have been biking since 90's the effectiveness of the HollowTech II and similar, crank designs are just so good.
  • 2 0
 pretty much every isis bb bikes in 2004
  • 6 0
 No wonder ISIS bikes are equipped with exploding components.
  • 2 0
 Not good news for Marin but at least they are doing something about it.
  • 1 0
 Bike companies seem to be turning to eBay to source parts these days just like the rest of us.
  • 1 0
 I can't believe they spec'd a friggin square taper BB crankset on a San Quentin.... a "Hardcore Hardtail".
  • 1 0
 Literally a nightmare for me to hear my precious bike getting recalled by the manufacturer
  • 1 0
 I had a bb break on me after a jump. Absolutely clapped my self in the balls and cut my calf.
  • 1 0
 ya my bottom bracket snapped in November of 2020 recently after I bought it
  • 2 0
 Hitting rock bottom.
  • 1 0
 Not the kind of turnover they want.
  • 1 0
 I bought a Rift Zone 27.5 V2 this year so I'm good..
  • 1 0
 This is going to effect their bottom line
  • 1 0
 @imnotdanny: Maybe Danny would have caught on to the joke.
  • 1 0
 Presideo was a turd of a movie.
  • 1 0
  • 1 0
 Breaking Bad 2021
  • 2 2
 How can it be square and a taper, hmmmmmm?
  • 2 0
 Its 3-dimensional duh! Cross-section/face etc
Below threshold threads are hidden

Copyright © 2000 - 2022. All rights reserved.
dv56 0.015872
Mobile Version of Website