With the launch of the new Brompton 20″ G-Line, I’ve put together a table comparing the G-Line to the MTBrompton. I’ve also added a comparison with an 18″ Brompton, because I think that is actually more like what the G-Line is like.
| Brompton G-Line | Kinetics MTBrompton | Kinetics 18″ Brompton | |
| Folded Size? | 730 x 690 x 402 mm (0.2 m3) | 750 x 680 x 320 mm (0.16 m3) | 650 x 630 x 310 mm (0.13 m3) |
| Weight? | 13.9kg (no rack or mudguards) 14.85kg to 15.25kg (with rack and mudguards) | 14.1kg (no rack or mudguards) 14.75kg (integral rack and mudguards) | 12.9kg (no rack or mudguards) 13.5kg (integral rack and mudguards) |
| Disc Brakes? | Tektro hydraulic | TRP Spyre Magura MT4, MT5 etc Hope XCR | TRP Spyre Magura MT4, MT5 etc Hope XCR |
| Hub Gear? | Alfine 8-speed | Alfine 8-speed or 11-speed Rohloff 14-speed Enviolo | Alfine 8-speed or 11-speed Rohloff 14-speed Enviolo |
| Derailleur Gear? | 4-speed on Electric models | Up to 12-speed | Up to 12-speed |
| Drive? | Chain drive | Chain or Belt drive | Chain or Belt drive |
| Wheel Size? | 20″ up to 2.1″ wide | 20″ up to 2.4″ wide | 18″ up to 2″ wide 20″ up to 1.35″ wide |
| Electric Assist? | Yes, rear hub motor with 4-speed derailleur | Yes – any front hub motor system, or Pendix mid drive | Yes – any front hub motor system, or Pendix mid drive |
| Lighting? | Optional battery lights | Optional battery lights or hub dynamo | Optional battery lights or hub dynamo |
| Rack? | Optional rear load platform for top bags | Optional integrated rack for panniers | Optional standard Brompton rack Optional integrated rack |
| Colours? | Adventure Orange, Traildust White, Forest Green | Any standard Brompton colour Custom colours at extra cost | Any standard Brompton colour Custom colours at extra cost |
| Luggage? | Brompton-specific front bags, small rack-top bag at back. | Brompton-specific bags, or full-size panniers front and back | Brompton-specific bags, or full-size panniers front, and rack top bag |
| Material? | Steel mainframe and rear triangle, aluminium fork and stem | Steel mainframe, stainless rear triangle, Columbus steel fork | Steel mainframe, stainless rear triangle, Columbus steel fork |
| Geometry? | Bottom bracket height 290mm Wheelbase 1115mm | Standard geometry: BB height 350mm Handlebar height (S) 1030mm Head angle 70 deg Seat angle 72 deg Dropped geometry: BB height 300mm Head angle 66 deg Seat angle 68 deg Wheelbase 1118mm | Bottom bracket height 300mm |
| Upgrade? | All new bike, existing bikes cannot be upgraded | Existing Bromptons can be upgraded from £1435 | Existing Bromptons can be upgraded from £1275 |
| Made? | Made in the UK and other countries | Handmade in Scotland | Handmade in Scotland |
| Cost? | From £2499 (with rack and mudguards) | From £2635 | From £2660 (with mudguards) |
Thank you for this, I was interested what the difference in BB height was and now I know.
Cheers
Tony
Hi Ben , Love your work and am considering having a mtb kit from you soon . One thing I’m slightly confused by though is on your YT video , riding your bike in Arran , you have a banner running below that says “MTB optimized adjustable geometry ” ….would you mind explaining how the geometry is adjustable because from the limited photos I’ve seen I can’t understand what the “banner” relates to ? Much appreciated , Bill in Exeter.
I’ve been experimenting with a thin spacer instead of the rear suspension elastomer – this drops the bottom bracket height down, and give slacker angles which feel really good off road, at the expense of losing the rear suspension. But with fat tyres, that’s not really important.