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Brompton website is probably a good start, or your nearest stockist to see in person (Brompton junctions have a good selection of in London). https://www.brompton.com/bikes/help-me-choose
In my experience:
- upright position = m or h bar // Sporty = s bar
- You can’t change easily between the two, as the stems are different so try both and see.
- Mudguards = a must for general use.
- Rack is useful if you’re rolling it a lot, but most of the time is not needed as anything on the rack needs taking off before it can fold.
- A wider bar makes it feel more like a road bike, Joseph Kousac options on SJS are a popular choice.
- Gearing choice = depends where you live and it’s use. Single speed is lightest but I found it hard work. I liked my 6 speed, but would possibly go with three around London.
- Luggage mount = a must. Choose your bag depending on use.
- Dynamo = nice to have as you never need to think about lights and can just jump on and go, but does come at a price.
- upright position = m or h bar // Sporty = s bar
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3 handlebars;
S -Sport
M- medium
H - high3 gear options;
2 speed derailed
3 speed ihg - most reliable and easy to use
6 speed 2x3 - widest range, 2 shifters thoChoose colour
Mudguards + pump yes or no (yes)
Rear rack - good if you NEED to roll the bike along, otherwise waste of £120
Front bag blocks are included on every bike
Seatpost length; standard, extended, telescopic - the measurements for each are online.
Tyres; low stock, OE is a marathon racer which is fine for most. Marathon / marathon plus for heavy duty commuter or continental for good grip / durable a balance, Schwalbe one for ultimate lightweight and comfy
Any bike you buy can have the stem / bars changed / drivechain etc it’s just not the cheapest.
Aftermarket options include 18/20” wheels tyres up to 2.7”, disc brakes, carbon / Ti stuff, Alfine / Rohloff gears etc
Having had a loan of a super-fun, but tired 3sp Brompton last summer, I am still itching for one. I'm uncertain of the exact model I was riding but there were a few things I didn't get on with - mainly the handlebar setup - IIRC was an H setup.
Could someone direct me to a noob friendly guide to all of the standard options for a Brompton - have had a long trawl through the thread but was wondering if such a thing existed. Apologies if the answer is just: Brompton website. Cheers all.