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Old 10-11-17, 03:50 PM   #1
rec
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Brompton rear triangle fold under question

About 15 years ago, I got to borrow a late '90's Brom for a couple months and for that vintage Brom, the rear triangle wasn't locked to the seat cluster so that whenever you went off a curb or lifted the saddle the rear triangle would automatically swing at the bb hinge and fold under the main triangle.

I saw a late model Brom on the street the other day and it seems that newer Broms now have the rear triangle locked or better connected to the seat cluster so that the rear triangle doesn't fold under as easily.

What model year did Brompton implement this change?

It used to be impressive to onlookers and fun and fast to dismount the brom 'cross style, lift the saddle, rear triangle would fold under and a super quick fold would ensue.

Is it now not possible to start a fold from dismount as quickly? How does one now disconnect the rear triangle from the seat cluster? Is there a locking latch there now?

Last edited by rec; 10-11-17 at 03:53 PM.
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Old 10-11-17, 04:03 PM   #2
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Not sure when the change happened but it was several years back. The suspension block can be turned if you want to disable the locking feature. Doesn't even require a tool. Most of our customers prefer the way the bike ships now, but people who have experience with older Brompton bikes occasionally prefer things the way they were before. Easily done.
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Old 10-11-17, 04:12 PM   #3
rec
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I'm looking to get a 2010 ti brom, do you think it has the suspension block lock? If not, can the block lock be adapted to older frames?
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Old 10-11-17, 04:47 PM   #4
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2007.
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Old 10-11-17, 09:15 PM   #5
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thanks for the info, odiolalluvia and chagzuki.
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Old 10-12-17, 01:55 AM   #6
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... can the block lock be adapted to older frames?
Yes, we did that. Our bikes (bought lightly used) came without. Until I had investegated what we needed to buy and install we just used a bungee elastic with a plastic hook to keep it in place.

Last edited by badmother; 10-12-17 at 07:45 AM.
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Old 10-12-17, 03:53 AM   #7
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Since 2007 all Bromptons were fitted with the lockable rear triangle..If you turn the suspension block 180 degrees you turn it back to the unlockable position where it folds underneath on its own when you lift the bike up to go over a kerb or up some stairs..I think most Brompton owners prefer the rear triangle in the locked position..
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Old 10-12-17, 05:23 AM   #8
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Originally Posted by tudorowen1 View Post
Since 2007 all Bromptons were fitted with the lockable rear triangle.
To be precise: It was invented as a standard with the model year 2008, probably starting around winter 2007. Before that it was an extra (I think since early 2007). The rounded lever on the seatpost that is mandatory for the locker became standard in mid 2007.
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Old 10-12-17, 10:37 AM   #9
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My 90's Mk 2 folded every time you lifted the bike, so I bought the latching kit they currently use,

But, if you rotate the elastomer ,
away from the notch in its end (less than 180 degrees) , it again, won't catch on the bolt head, and fold every time you lift the bike.

If, for a time, you want that feature, again....





....
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Old 10-13-17, 07:32 AM   #10
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In addition to this, I'm going to go for a Brompton at the end of the year, however, I need to carry it up two flights of stairs at work. Now I've seen pics online of the Brompton folded up and staying folded up (with the rear triangle tucked up) but does it lock in position there? I don't want it flopping down when I'm trying to carry it, and my experience with a Brompton that I rode a couple of years back was that the rear triangle couldn't be locked in the folded position. Am I missing something?
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Old 10-13-17, 09:05 AM   #11
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The lock, folded is a function of the stop disc, it's on the end of their brake mounting bolt, and the QR 'telescoping'seat post pushed down.

stop disc then hits seatpost, so wont unfold..








...
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Old 10-13-17, 09:09 AM   #12
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aaaahhhh ok, I get you. Cheers for the answer!
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Old 10-13-17, 10:13 AM   #13
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Originally Posted by checoles View Post
In addition to this, I'm going to go for a Brompton at the end of the year, however, I need to carry it up two flights of stairs at work. Now I've seen pics online of the Brompton folded up and staying folded up (with the rear triangle tucked up) but does it lock in position there? I don't want it flopping down when I'm trying to carry it, and my experience with a Brompton that I rode a couple of years back was that the rear triangle couldn't be locked in the folded position. Am I missing something?
You can not lock the rear triangle only- as in a parked position but when the bike is properly folded it does not come apart (unless you have been "playing with it" without being sure what you actually did to it.. )

When you get used to the bike you`l be able to carry it half folded too becouse you have found a way of doing it. First learn the exact way to do it- and why. After that you learn to improvise.
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Old 10-13-17, 01:54 PM   #14
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A strap, around the rear wheel and the frame tube, when folded , can keep it folded.. if that is your goal ..

shoulder under the nose of the saddle, rear folded to make the corners at the top of a landing of a multi floor walk-up, stairs,

it may may be useful ..
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Old 10-13-17, 04:13 PM   #15
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You may discover (as I have) that your Brompton is easier to carry upstairs unfolded. The weight is balanced across the frame that way and feels lighter than when it's all compacted into the center.
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Old 10-16-17, 01:12 AM   #16
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ah ok, this has been great advice!
Cheers
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