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29 votes
Accepted

Why aren't 16" wheel city bikes more common?

I have ridden bikes with different sizes of wheels, from 29" MTB/622 Road wheels, through 20" folder, 12" scooters, and one folding A-bike with 6" wheels. My perception is that ...
Criggie's user avatar
  • 125k
11 votes

Why aren't 16" wheel city bikes more common?

I cycle round a city (Chester) every day, typically covering five to ten miles in a trip. Even though this is on allegedly high quality roads the reality is that there are a lot of potholes and other ...
John Rennie's user avatar
10 votes

How to determine chain length on a Brompton?

There is no one standard Brompton chain length; there are 4 different ones for the various sanctioned drivetrains. For nonstandard Brompton drivetrains, I've had good luck using the longest length ...
Nathan Knutson's user avatar
9 votes

Tyres self-deflating after being in storage

If you pumped up the tubes outside the tyres, you probably didn't pump them up very hard (or they would have gone bang). There probably wasn't enough pressure for them to go down quickly so you didn't ...
Chris H's user avatar
  • 59.7k
8 votes

Is a brompton right for my riding style?

I have a Brompton and it’s a great bike. It really shines in three circumstances: mixed mode commuting where you might ride for a bit then fold it up and take it on a bus, car, or, train and then ...
RoboKaren's user avatar
  • 29.2k
7 votes

What size replacement brake pads for the Brompton?

Brompton brake pads are made using Shimano Road specifications. So any pad compatible with Shimano Road brakes will work. Difficult to find "evidence" for this claim though (because of ...
Rеnаud's user avatar
  • 20.6k
6 votes

Why aren't 16" wheel city bikes more common?

I can easily bring it up the stairs even without folding it or really quickly lift it from the frame to get across complicated obstacles on the road (say up a curb or past construction work areas). ...
juhist's user avatar
  • 19.1k
6 votes

Seat post keeps sliding down after cleaning and lubricating folding bike

This page from an Australian Brompton retailer suggests 3 options (you've probably tried the 2 first ones): cleaning the seatpost and the tube with isopropyl alcohol. tighten the clamp (by one ...
Rеnаud's user avatar
  • 20.6k
5 votes

Why aren't 16" wheel city bikes more common?

Besides performance, another issue of small wheels is also comfort. When the state of the road is not good (which is more the rule than the exception), you really feel every bump with a 16 inch wheel (...
Rеnаud's user avatar
  • 20.6k
5 votes

Tyres self-deflating after being in storage

So, just to clarify, do you mean you removed the innrer tubes from the wheels and pumped them up, then deflated and re-installed them? It's possible you pinched the tube when putting it back on. To ...
ilikeprogramming's user avatar
4 votes

Can I use a Brompton bike with a trailer like the Thule Chariot Cougar?

This should work. I use the Thule Chinook 1 with my Brompton folding bike. The only inconvenience is that the front wheel is best not folded down but removed. The clearance with the ground is too ...
Christopher's user avatar
4 votes

How do airlines calculate the cost of a Brompton?

This is a hard question to answer. Not only does each airline have its own rules as to handle bicycles or what they consider oversized luggage — the airline counter staff at check-in have “discretion”...
RoboKaren's user avatar
  • 29.2k
4 votes

Why are IGH minimum gears expressed as ratios not contigent on wheel size?

What propels you forward is force not torque. A small wheel requires little torque to generate a given force, whereas a large wheel requires more torque to generate a given force. Thus, on a small ...
juhist's user avatar
  • 19.1k
4 votes

Brompton cable & housing replacement

The Brompton uses standard gear/shifter cables and brake cables. Flat bar brake levers use the same cable head as a mountain bike (i.e. barrel, not pear). The handlebar selection could make a small ...
Noise's user avatar
  • 14.2k
4 votes

Why aren't 16" wheel city bikes more common?

The ground clearance is important in the city. When riding next to the pedestrian pavement that is raised, it is safer to have enough ground clearance so not to hit the edge of that pavement with the ...
nightrider's user avatar
  • 7,879
3 votes

Why aren't 16" wheel city bikes more common?

A big issue is cost. The small wheels themselves add a little to the cost due to rarity value of the wheels and the drivetrain (big chainrings aren't so common). The fact that most small-wheel adult ...
Chris H's user avatar
  • 59.7k
3 votes

how is the middle of a folded Brompton supported?

From a phyics or engineering point of view, I don't know, something on the order of 20/30 kgs, maybe? From the warranty and manufacturer recommendation, the answer is 0. A folded Brompton (and other ...
EarlGrey's user avatar
  • 3,700
3 votes
Accepted

How to remove rear wheel of old school Brompton 3-speed

Just press the metal clip and you can simply pull them apart (with very little force). Tipp: attach some tape to where the plastic part engages the threaded rod so you don't have to readjust the ...
Xenox's user avatar
  • 346
3 votes

Why are IGH minimum gears expressed as ratios not contigent on wheel size?

The bicycle is being propelled from the drivetrain, not from the rim. Assume the worst case scenario: the wheel is frozen in place and the rider is pushing on the pedals. The chain tension force here ...
MaplePanda's user avatar
  • 15.6k
3 votes

Older Brompton front brake cable

Your own posted link says Brompton with the 10 degree brake levers with an open clevis should be replaced with either the 30 degree or new aluminium brake levers. Sounds like the 10 degree ones ...
Criggie's user avatar
  • 125k
3 votes

Brompton Rear Brake Caliper Assembly Schematic

I cannot comment to the previous answer so I will write a new one. The order specified in the previous post is different compared to what the data sheet says. The order of components for the brake ...
Birger's user avatar
  • 31
3 votes
Accepted

Brompton Rear Brake Caliper Assembly Schematic

I was successfully able to repair this loss. It required the following items that fell off the brompton rear brake bolt: 2x concave washers 1x spring washer 1x M6 flat washer 1x Brompton Rear Brake ...
qzcft's user avatar
  • 101
3 votes
Accepted

short cranks for new Brompton JIS bottom bracket

It seems to be fairly straightforward, I found a number of links around the web to people who have done it. Any crankset can take a single chainring, just make sure you mount it on the correct side of ...
Móż's user avatar
  • 23.6k
3 votes
Accepted

How to safely transport a Brompton by air?

I check in my Brompton when I fly. I built a special case for it in my workshop using 2020 extrusion and coroplast that is 24x24x11.5 inches and exactly fits the Brompton. They also sell hard cases ...
RoboKaren's user avatar
  • 29.2k
3 votes

Seat post keeps sliding down after cleaning and lubricating folding bike

I assume you’ve tightened the seatpost clamp sufficiently? The professional way to increase friction for seatposts is by using carbon installation compound. You could try to remove all oil/grease with ...
Michael's user avatar
  • 27.8k
3 votes

Seat post keeps sliding down after cleaning and lubricating folding bike

I had the exact same problem on my Brompton. When riding for long distances, the seatpost would gradually slip and move downwards. Thus, if I had the correct seat height at the start of the ride, I ...
juhist's user avatar
  • 19.1k
3 votes

What size replacement brake pads for the Brompton?

Brompton can sell parts directly to the consumer. Here is the complete brake pad set you can buy on their online store. The length of the pads is 54 mm. The link points to the US website, but you can ...
olliebulle's user avatar
  • 4,119
3 votes

Is a Brompton Front Wheel symmetric?

Front wheels with rim brakes are usually symmetrical, but if Bromptons were an exception, the distance between brake pads and the rim (after having mounted the wheel) should be a pretty good indicator ...
Rеnаud's user avatar
  • 20.6k
3 votes
Accepted

Is a Brompton Front Wheel symmetric?

Is the Brompton front wheel symmetrical? This depends on whether you have a hub dynamo. Hub dynamo wheels have a specific rotation direction. The connector is one side, and your bike has the wiring ...
juhist's user avatar
  • 19.1k
3 votes

Is play on the Schlumpf Mountain Drive chainring a problem? How to fix?

I only have a sample size of one Schlumpf bike I've done an install and some maintenance for, but it appears normal. See page C-1 of the user manual you link to. The "some play between the ...
Nathan Knutson's user avatar

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