Three ways to understand its construction before deciding whether it fits your riding.
Weight
Mid-weight
1,595 g claimed / pair
1,000 g1,800 g
It falls in our third weight band. Use the pair weight to compare how much each option adds to your complete bike.
How this class is defined
Very light: up to 1,300 g
Light: above 1,300 to 1,450 g
Mid-weight: above 1,450 to 1,600 g
Heavier: above 1,600 g
These editorial bands are not an industry standard or a performance rating.
Pair weight alone does not establish stiffness, acceleration or climbing time.
Rim profile
Mid-depth
47 mm front / rear
Front47 mm
Rear47 mm
Front and rear share the same depth. Depth describes the rim shape; it is not a measured aero result.
How this class is defined
Shallow: below 35 mm
Mid-depth: 35 to below 50 mm
Deep: 50 to below 65 mm
Very deep: 65 mm and above
Each rim is classified separately using the unrounded dimension. A category boundary does not create a sudden change in performance.
Tyre platform
Hooked
25 / 25 mm internal width
29–76 mmcatalogue tyre range
Hooked rim construction
The catalogue records a 29–76 mm tyre range. Match your exact tyre and pressure to the manufacturer's rim guidance.
What this means for your tyres
Assess front and rear tyres separately. Confirm the exact tyre, pressure limits and fitted frame clearance before buying. The listed range is not approval for your complete bike. Open the Fulcrum product page ↗
Technical classes describe properties. They do not depend on your budget or riding profile, and they are not a personal Fit score.
The character of this wheelset
A mid-weight pair with equal front and rear rim depths, steel spokes and steel bearings. Compare its 47 mm front rim and 25 mm internal width with the alternatives below, then check your tyres and total system weight before making a buying decision.
02 / SEE IT IN CONTEXT
In our catalogue.
Where the SONIQ 42 sits among the 127 road disc wheelsets in the Show My Bike catalogue. Each dot is one wheelset. Positions describe specifications; they are not a rating.
Weight
At 1,595 g, it is lighter than 8 of the 126 other wheelsets with a confirmed weight in our catalogue. Among the 47 mid-depth wheelsets with a confirmed weight, it is the 2nd heaviest.
Price
At €1,189, it is less expensive than 94 of the 126 other wheelsets in our catalogue. Among the 47 mid-depth wheelsets, it is in the middle of the group, 14th from the least expensive.
Widest listed tyre
Its listed range goes up to 76 mm, the widest maximum in our catalogue, shared with 2 other wheelsets.
Rim-depth groups use the average of front and rear depth: shallow-rim below 35 mm, mid-depth 35 to below 50 mm, deep-rim 50 to below 65 mm, very deep-rim 65 mm and above. Weights are manufacturer claims; wheelsets with an unverified weight are left out of the weight comparison. Prices from our October 2026 price check.
03 / WHAT IT MEANS
What the specs mean.
General context for the SONIQ 42's key specifications. Numbers in superscript link to the sources below each topic. How much each point matters depends on your riding, tyres and bike.
Internal rim width: how the tyre sits
The SONIQ 42 has an internal rim width of 25 mm and an external width of 29.8 mm.
internal25 mm
external29.8 mm
A wider internal rim spreads the tyre beads further apart, so the same tyre mounts wider and with more air volume: roughly 0.4 mm of tyre width per extra millimetre of rim width.1 A tyre labelled 28 mm can measure around 30 mm on a 21 mm rim,2 so check frame clearance against the measured width, not the printed one.4
Typical road rims have moved from about 19 mm internal width around 2020 to 21–25 mm, together with wider tyres. A wider rim also raises the narrowest tyre you may fit and, on hookless rims, comes with pressure limits.3 Brands usually shape the rim around a target tyre width for aerodynamics, so the fastest combination is not simply the widest tyre.5
Fulcrum approves tyres from 29 mm to 76 mm for this rim.
SONIQ 4229–76 mm
An approved tyre range is the span of tyre widths a manufacturer permits for a rim, based on the ETRTO/ISO tables for tyre and rim combinations.2 Not every brand publishes one: some give a recommendation only, or no maximum. The lower end is the narrowest tyre that fits that internal width safely; the upper end shows how far you can go towards wider, lower-pressure tyres for comfort and grip on rough roads or gravel, provided your frame has the clearance.4
In TOUR's tests, wider tyres at a pressure matched to their width roll about as easily as narrower ones on smooth surfaces and add comfort and grip on real roads, while a tyre much wider than the rim costs some aerodynamic drag.1 Pressure calculators such as Zipp's take the rim's internal width into account as well as the tyre.3
A carbon spoke weighs roughly half as much as a premium steel bladed spoke,1 and brands state that carbon is stiffer for its weight.2 That is why carbon-spoke versions often use fewer spokes and weigh less: Hunt's Limitless Ti_UD uses 15/18 carbon spokes against 20/24 steel spokes on the standard Limitless.3 Some reviewers describe a more direct feel when sprinting; that is a riding impression, not a measurement.5
Steel spokes such as DT Swiss Aerolite or Sapim CX-Ray are standard parts that most workshops can source and replace.4 Carbon spokes are more sensitive to side impacts, for example from a derailleur or debris, and may need brand-specific parts or tools;1 some brands include spare spokes or crash replacement to offset this.5 Visually, the lower spoke count and slim blades give carbon-spoke wheels a lighter, more open look.
Start with the rim dimensions, then look at the evidence behind the complete wheel-and-tyre setup.
Rim geometry
The shape behind the profile
The SONIQ 42 has 47 mm front and rear, with an external front width of 29.8 mm. These dimensions describe its shape; they do not establish a measured speed advantage.
The front rim is 47 mm deep. For exposed roads, compare the front-wheel design and evidence for your tyre setup. Depth alone cannot predict how confident you will feel in gusts.
Rim depth in context
Cross-section drawn to scale from the catalogue values for outer width, internal width and depth; hooked rims show the bead hook. Simplified shape, not the manufacturer's exact profile.
Deeper rims generally reduce aerodynamic drag, which pays off most at higher speeds on flat or rolling roads, but they tend to weigh more and can be more affected by gusty crosswinds. In a BikeRadar comparison, 60 mm aero wheels were about a second per kilometre faster on the flat but slower on steep climbs than a considerably lighter set.1
How a wheel behaves in crosswinds depends on the rim shape as well as its depth,3 which is why TOUR measures steering torque in the wind tunnel, not just drag.2 Shallower rims are generally easier to handle in gusts, something lighter riders and riders on exposed roads tend to notice first.1
Show My Bike publishes no aero or crosswind rating on product pages. Find My Fit uses rim depth and width as a rough proxy when it ranks wheelsets for your riding; how that works is explained on How We Score.
No automatic comfort or durability rating is assigned from rim width, spoke material, bearing type or warranty length.
05 / CHECK THE DETAILS
Full specifications.
Steel spokes · Steel bearings. Front and rear dimensions are shown separately.
Weight & price
Claimed pair weight
1,595 g
Catalogue price
€1,189
MSRP
€1,590
Price snapshot
October 2026
Rim geometry
Property
Front
Rear
Rim depth
47 mm
47 mm
External width
29.8 mm
29.8 mm
Internal width
25 mm
25 mm
Spoke count
24
24
Tyres & setup
Wheel size / brakes
700C / disc
Rim construction
Hooked
Internal width
25 mm, both wheels
Listed tyre range
29–76 mm
Maximum system weight
130 kg
Construction & support
Spokes
Steel
Bearings
Steel
Warranty
2 years; conditions apply
Crash replacement
No
Warranty and crash replacement cover different situations. Check eligibility, exclusions and any fees with Fulcrum. Manufacturer information ↗
Before you decide.
How much does the Fulcrum SONIQ 42 weigh?
Fulcrum claims 1,595 g for the pair, which makes it lighter than 8 of the 126 other wheelsets with a confirmed weight in our catalogue. Claimed weights do not always include rim tape and valves.
What tyre width fits the Fulcrum SONIQ 42?
Fulcrum approves tyres from 29 mm to 76 mm for this rim. The internal rim width is 25 mm. On wide rims, tyres usually measure wider than the size printed on them, so check your frame clearance as well.
What is the internal rim width of the Fulcrum SONIQ 42?
25 mm. The external width is 29.8 mm.
Is the Fulcrum SONIQ 42 hookless?
No. It uses a hooked rim, which also accepts tyres that are not approved for hookless rims, within the listed range and the pressure limits of rim and tyre.
How much does the Fulcrum SONIQ 42 cost?
€1,189 per pair at our October 2026 price check; the manufacturer's recommended price is €1,590. Prices change, so check the current offer with the retailer or manufacturer.
Why call the SONIQ 42 "Mid-weight"?
Its 1,595 g claimed pair weight is between our 1,450 g and 1,600 g boundaries. The description concerns weight only. It is not a rating of stiffness, quality or suitability for a particular rider.
Are all the listed tyre widths equally aerodynamic?
A tyre range does not establish equal aerodynamic performance across that range. Fulcrum approves tyres from 29 mm to 76 mm for this rim. Check the tyre requirements for your own setup and the manufacturer's guidance on the best width for this rim.
Sources & data notes.
Price checked October 2026. Model-specific details reviewed 3 October 2026. Manufacturer claims are identified as such. No independent product test is claimed.
