I’m trying to replace as many of the plastic parts on my Brompton as possible. I don’t like plastic on my bikes. This doesn’t mean that plastic parts don’t do the job they are made for. It’s more a question of personal taste.
Here it is – a large piece of plastic… no complains about it’s function, but the visual aspect stands back behind my expectations.
Easy to remove. We will need some parts of the old chain tensioner. The two wheels and the spring inside of the tensioner. The first thing to do is to remove the small caps on the wheel axis to get a look on the screws holding the wheels. Use a screwdriver to pull them out.
Unscrew both chain tensioner idler wheels and keep the washers you find too. If the wheels are outworn get new ones! If you remount them later use the washers in the same place as you found them here.
Remount both wheels on the new chain tensioner. Don’t forget the washers and do not overtighten the screws. I use Loctite threadlocker to secure the screws.
Now disassemble the two parts of the tensioner. You need the spring for your new beauty. The top of the spring is symmetric to the bottom.
Insert the spring in the new chain tensioner. Watch the nut for the spring – but it is nearly impossible to go wrong. Now screw on the other leg of the tensioner. Everything should move freely without any resistance.
What a nice piece of craftsmanship – isn’t it? With a quote from Heraclitus. Wow.
And here we have the new look of my Brompton. Again less plastic on the bike. I like the new chain tensioner a lot.