Przeprowadzka z 12-letnich MTB. 2 rowery do 5tys. każdy na dystanse do 100km

[Szwedacz]

Nie "do jazdy pod górę", tylko jest to związane z geometrią rowerów. Odpada przednia przerzutka, więc zostaje projektantom więcej miejsca na szeroką oponę i widełki dostosowane do szerszych piast. W fullach ułatwia to projektowanie zawieszenia. No i oczywiście można zastosować chainguide. Mniej manetek na kierownicy itp. to przy tym pierdoły. Reszta to kopiowanie ze świata MTB rozwiązań i wciskania ich w inne gałęzie rowerowania.

[jajacek]

Ale pomysł był z rowerów górskich w założeniu do jazdy pod górę. Dużo przełożeń do jazdy pod górę, mało do jazdy po płaskim i zero do jazdy z góry.
 

SRAM introduced the modern wide-range 1x (one-by) drivetrain in 2012 (shipping in October 2012) with the launch of its high-end XX1 1x11 mountain bike groupset. 

 

Introduction Details

• The Innovation: It featured a single front chainring paired with a wide-range 10-42 tooth rear cassette (offering a 420% gear range) and a specialized clutch rear derailleur with narrow-wide tooth profiling to keep the chain secure without a front derailleur. 

• Initial Bike Types: It was built specifically for mountain bikes—initially targeting Cross-Country (XC), All-Mountain, and Enduro riding. 

 

Expansion to Other Bikes

• Downhill and Trail: Shortly after the 2012 launch, SRAM expanded 1x systems across lower-tier mountain groups (like X01 and X1), making them standard on nearly all mid-to-high-end full-suspension and hardtail mountain bikes. 

• Cyclocross and Gravel: By 2015, SRAM adapted the technology for drop-bar bikes, introducing dedicated Force 1 and Rival 1 groupsets for cyclocross and gravel bikes. 

• Road and Commuter: Over subsequent years, 1x setups expanded further into endurance road, urban commuter, and specialized electric bikes.
  
  Czyli najpierw było 1x a dopiero potem uznano że potrzebne są inne, szersze piasty.

EDIT

A jednak nie tak było:
 

The adoption of thru-axle hubs occurred immediately alongside the launch of the first 1x drivetrains, but a major structural issue with those wheels led directly to the creation of the Boost standard a few years later. 

First Thru-Axle Hubs for 1x Drivetrains (2012)

When SRAM launched the XX1 1x11 drivetrain in October 2012, existing mountain bike thru-axle hubs were used to mount it. At that time, the industry-standard mountain bike hub dimensions were: 

• Front: 15x100mm thru-axle
• Rear: 12x142mm thru-axle

To fit the massive 10-42t 1x cassette onto these existing 142mm thru-axle hubs, SRAM had to develop the XD Driver Body. This allowed the cassette to sit firmly on existing thru-axle wheels without requiring a whole new hub width standard right away.

When Was "Boost" Introduced? (2015)

The Boost standard was officially introduced in March 2015. It was co-developed by Trek and SRAM to fix structural weaknesses caused by combining 1x drivetrains with larger 29-inch wheels. 

The Spacing Dimensions:

• Boost Front: Increased from 100mm to 15x110mm (+10mm width)
• Boost Rear: Increased from 142mm to 12x148mm (+6mm width)