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BH SL1 3.5 105 vs BH SL1 4.5 Ultegra Di2

BH SL1 3.5 105, side view

BH

SL1 3.5 105

BH SL1 4.5 Ultegra Di2, side view

BH

SL1 4.5 Ultegra Di2

Mid-rangeCarbon700c2026
High endEnduranceCarbon700c2026

Two builds of the BH SL1 line: 9 differences, mostly in the components.

BH SL1 3.5 105, side viewBHBH SL1 3.5 105
List price £2,272
BH SL1 4.5 Ultegra Di2, side viewBHBH SL1 4.5 Ultegra Di2
List price £3,636

At a glance

  • BH SL1 3.5 105 costs £1,364 less than BH SL1 4.5 Ultegra Di2 (list price).
  • BH SL1 4.5 Ultegra Di2 has the higher-range groupset: Shimano Ultegra Di2, against Shimano 105.
Key specs4 differences
List price £2,272 £3,636 +£1,364
Model yearSame for all 2026 2026
FrameSame for all Carbon
As printed

Toray T400 Carbon with HCIM (Hollow Core Internal Molding)

 Carbon
As printed

Toray T400 Carbon with HCIM (Hollow Core Internal Molding)

Wheelset 700c · Shimano RS171
As printed

Wheelset: Shimano RS171

 700c · Vision Team TC30 i23
As printed

Wheelset: Vision Team TC30 i23

DrivetrainSame for all 2×12 2×12
Groupset Shimano 105
As printed

Shimano 105 shift levers

 Shimano Ultegra Di2 Higher range
As printed

Shimano Ultegra DI2 shift levers

Brake model Shimano 105 hydraulic
As printed

Front/rear brake: Shimano 105 hydraulic

 Shimano Ultegra hydraulic Higher range
As printed

Front/rear brake: Shimano Ultegra hydraulic

SeatpostSame for all BH Lite 27,2 BH Lite 27,2

Prices

Each model's retailers, delivered to your country, and their prices over time.

BH SL1 3.5 105

BH SL1 3.5 105

BH SL1 4.5 Ultegra Di2

BH SL1 4.5 Ultegra Di2

Character

  • SL1 3.5 105 · Road bike average equipment, equipment for the price better than 88% of other road bikes.
  • SL1 4.5 Ultegra Di2 · endurance road bike, carbon frame, 700c wheels, 2×12 drivetrain, high end equipment

Equipment level

0255075100£4,000£6,000£8,000List priceEquipment score
  • BH Ultralight Evo Ii 6.0 105 Di2
  • BH Ultralight Evo Ii 7.0 Ultegra Di2
  • Merida Reacto 105 Di2
  • Merida Reacto 105
  • Merida Reacto 10k AXS
  • Merida Reacto Rival AXS E1
  • Merida Reacto Ultegra Di2
  • BH SL1 3.5 105
  • BH SL1 4.5 Ultegra Di2
  • SL1 3.5 105Equipment level 53/100 · Mid-range
  • SL1 4.5 Ultegra Di2Equipment level 78/100 · High end
BH SL1 3.5 105BH SL1 4.5 Ultegra Di2other road bikes

Components and specs

Every spec line by line; the higher range of a component is marked. The technical groups are folded.

Ride type
Ride type–Not given Endurance
As printed

Designed for those who seek long distances

Frame and fork
ForkSame for all Carbon
As printed

SL1 Disc Full Integrated Tapeder, Full Carbon 1.5´

 Carbon
As printed

SL1 Disc Full Integrated Tapered, Full Carbon 1.5"

Max tyre clearanceSame for all 32 mm 32 mm
AxlesSame for all Thru-axles
As printed

12 mm Thru Axle, hidden and tool-free

 Thru-axles
As printed

12 mm Thru Axle, hidden and tool-free

Bottom bracketSame for all BB386EVO
As printed

BB386EVO system

 BB386EVO
As printed

BB386EVO system

Seatpost diameterSame for all 27.2 mm 27.2 mm
Drivetrain4 differences
Groupset brandSame for all Shimano
As printed

Shimano 105 shift levers

 Shimano
As printed

Shimano Ultegra DI2 shift levers

Shifting Mechanical
As printed

Shimano 105 shift levers

 Electronic, wired
As printed

Shimano Ultegra DI2 shift levers

ChainringsSame for all 2 °Value not published by the brand 2 °Value not published by the brand
Gears at the backSame for all 12 12
Chainring teeth FSA Gossamer 50/34
As printed

Crank set: FSA Gossamer 50/34

 Shimano Ultegra 52/36
As printed

Crank set: Shimano Ultegra 52/36

CassetteSame for all Shimano 105 11/34
As printed

Cassette: Shimano 105 11/34

 Shimano 105 11/34
As printed

Cassette: Shimano 105 11/34

Rear derailleur Shimano 105 12sp °Value not published by the brand Shimano Ultegra DI2 12sp °Value not published by the brandHigher range
Shifters Shimano 105 °Value not published by the brand Shimano Ultegra DI2 °Value not published by the brandHigher range
Brakes
BrakesSame for all Hydraulic disc
As printed

Shimano 105 hydraulic (SL1 Disc frame)

 Hydraulic disc
As printed

Shimano Ultegra hydraulic (SL1 Disc frame)

Wheels and tyres1 difference
Wheel sizeSame for all 700c / 29"
As printed

Chaoyang Shark 700x 28

 700c / 29"
As printed

Hutchinson Nitro 700x28

RimsSame for all Aluminium °Value not published by the brand Aluminium °Value not published by the brand
Tyres Chaoyang Shark 700x 28
As printed

Tyres: Chaoyang Shark 700x 28

 Hutchinson Nitro 700x28
As printed

Tyres: Hutchinson Nitro 700x28

Tyre width fittedSame for all 28 mm 28 mm
Cockpit and seatpost1 difference
Handlebar BH Lite Compact °Value not published by the brand FSA Energy ACR °Value not published by the brand
StemSame for all BH SL °Value not published by the brand BH SL °Value not published by the brand
Seatpost modelSame for all BH Lite 27,2 °Value not published by the brand BH Lite 27,2 °Value not published by the brand

° Value not published by the brand

Where to buy them

Frequently asked questions

Which is cheaper, BH SL1 3.5 105 or BH SL1 4.5 Ultegra Di2?

BH SL1 3.5 105 has the lower list price: £2,272, against £3,636 for BH SL1 4.5 Ultegra Di2. Today's prices by frame size are in the prices section.

What groupset do BH SL1 3.5 105 and BH SL1 4.5 Ultegra Di2 come with?

BH SL1 3.5 105: Shimano 105. BH SL1 4.5 Ultegra Di2: Shimano Ultegra Di2.

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