The 26X1/8 Road Bike Tires are worth considering for a road bike confirmed to use 37-590 rims, with two tires and tire levers listed at $29.99 26X1/8 (37-590) Road Bike Tires with or…. I wouldn’t buy them for 37-559 wheels. The listing also leaves the exact tube-width range and tire-pressure specification unavailable, so those details need confirmation before fitting 26X1/8 (37-590) Road Bike Tires with or….
- The listing identifies SIMEIQI model SMQ261138 as a clincher road-bike tire with a slick tread 26X1/8 (37-590) Road Bike Tires with or….
- The package is listed as two ×/8 tires with tire levers 26X1/8 (37-590) Road Bike Tires with or….
- The listed price is $29.99 and availability is In Stock 26X1/8 (37-590) Road Bike Tires with or….
- The product is marked 37-590 and is not intended for 37-559 rims 26X1/8 (37-590) Road Bike Tires with or….
- The ×/8 size uses a mm ISO bead-seat diameter, while × 1.75 uses mm 26 Inch Bicycle Tires.
What does the 26X1/8 Road Bike Tires listing include, and who is this tire intended for?
The 26X1/8 Road Bike Tires listing identifies SIMEIQI model SMQ261138 as a clincher tire for road bikes, with a slick tread and rubber construction 26X1/8 (37-590) Road Bike Tires with or…. The 26X1/8 Road Bike Tires package is listed as two tires plus tire levers 26X1/8 (37-590) Road Bike Tires with or….
The listing also describes the tires as foldable, with carbon steel beads, which is a storage-related design claim rather than a result I independently verified 26X1/8 (37-590) Road Bike Tires with or…. The listed price is $29.99, and the Amazon listing says the item is In Stock 26X1/8 (37-590) Road Bike Tires with or….
The most important buying restriction is fit. The 26X1/8 Road Bike Tires listing specifically warns that the product is not for the 37-559 standard 26-inch size 26X1/8 (37-590) Road Bike Tires with or…. I’d therefore treat this as a product for bicycles requiring the 37-590 designation, not as a universal 26-inch replacement.

26X1/8 (37-590) Road Bike Tires with or Without Bike Tubes 26×1.3/8 32mm AV Schrader Valve
$29.99
In Stock
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What does ×/8 mean, and what are the tire’s approximate width and diameter?
The 26X1/8 Road Bike Tires label uses traditional inch sizing: the first number refers to outside diameter and the second refers to tire width, although those labels may not match actual dimensions 26 Inch Bicycle Tires. A listed 26-inch by 1.38-inch tire therefore gives an approximate diameter and width marking, not a guarantee of measured dimensions Amazon.com: BELL Inertia Road Tire 26" x/8"… 26 Inch Bicycle Tires.
The 26X1/8 Road Bike Tires size is commonly discussed as about 35–37 mm wide in the 650A/ISO size family Current 26″ x/8″ (aka 650A or ISO 590) tire…. That range is more useful for planning clearance than treating/8 inches as an exact measured width, but the supplied claims don’t provide a measurement for this particular SIMEIQI tire.
For the 26X1/8 Road Bike Tires, I’d use the sidewall’s 37-590 marking as the practical identification and then check the bicycle’s rim and frame before fitting.
What ISO bead-seat diameter does ×/8 use compared with × 1.75?
The 26X1/8 Road Bike Tires size corresponds to a mm ISO bead-seat diameter, and Michelin pairs ×/8 with ETRTO 37-590 and × 35A Bike Tire Sizes Explained | Michelin USA 26 Inch Bicycle Tires. The bead-seat diameter is the critical rim-fitting dimension.
By contrast, the 26X1/8 Road Bike Tires standard is mm larger at the bead seat than the common mountain-bike 26-inch size, which uses mm Current 26″ x/8″ (aka 650A or ISO 590) tire…. The difference is large enough that the shared “26” label should not be used as the fit check.
A × 1.75 tire belongs to the decimal-designation mm size, while ×/8 is the English mm size 26 Inch Bicycle Tires. For that reason, 26X1/8 Road Bike Tires cannot be treated as interchangeable with × 1.75 simply because both markings include inches.

How can I check whether a ×/8 tire will fit my bicycle’s rim?
The first check for 26X1/8 Road Bike Tires is the ISO bead-seat diameter: the tire and rim should correspond to the mm size 26 Inch Bicycle Tires. The product listing identifies the tire as 37-590 and explicitly says it is not intended for 37-559 rims 26X1/8 (37-590) Road Bike Tires with or….
Next, check inner rim width. WTB defines that measurement as the narrowest point between the bead hooks on the rim walls or legs that hold the tire Tire & Rim Fit Chart. The 26X1/8 Road Bike Tires size can’t be judged from the wheel’s outside label alone.
Use the WTB Tire & Rim Compatibility Chart to assess tire-and-rim width combinations Tire & Rim Fit Chart. For an unusual rim profile or an uncertain match, the supplied guidance recommends sending the rim profile to the tire manufacturer for a further check Tire Size Chart For Bicycle Rims. I’d complete those checks before installation.
What inner tube size and valve type are compatible with a ×/8 tire?
The 26X1/8 Road Bike Tires listing names a mm AV Schrader valve option and says the tires are offered with or without bicycle tubes 26X1/8 (37-590) Road Bike Tires with or…. That describes the valve arrangement, not the wheel diameter.
For 26X1/8 Road Bike Tires, the tube should be matched to the mm bead-seat diameter and to a compatible tube-width marking Bike Tire Sizes Explained | Michelin USA 26 Inch Bicycle Tires. I would not select a tube solely because its packaging says “26 inch,” since the 26-inch label covers more than one bead-seat diameter.
The supplied claims do not state the exact inner-tube width range for this product. That information is therefore unavailable here, and I wouldn’t infer it from the tire’s nominal size. Valve type and bead-seat diameter answer separate questions: the former concerns the valve opening, while the latter concerns whether the tire fits the rim 26X1/8 (37-590) Road Bike Tires with or… 26 Inch Bicycle Tires.

Can I replace a ×/8 tire with a different width, and what clearances should I check?
The 26X1/8 Road Bike Tires width should not be changed without checking both the rim’s compatible width range and the bicycle’s available clearance. Michelin says rims have a recommended range of tire widths, while the frame and fork have maximum clearances before contact Bike Tire Sizes Explained | Michelin USA.
A mm tire may cause clearance problems on bicycles designed around narrower tires, and wider tires can create issues on frames designed for one width Current 26″ x/8″ (aka 650A or ISO 590) tire…. Those warnings matter when considering a replacement for 26X1/8 Road Bike Tires, even if the replacement keeps the same nominal diameter.
A mm tire is described in the cited size discussion as the widest available in that size, but it may create clearance problems on old Raleigh bicycles Current 26″ x/8″ (aka 650A or ISO 590) tire…. For a significant size change, Michelin advises consulting a bicycle professional or the bicycle manufacturer Bike Tire Sizes Explained | Michelin USA.

How do I confirm the correct tire size from the markings on my existing tire or rim?
The 26X1/8 Road Bike Tires size should be checked against the markings already on the bicycle. Michelin advises reading the numbers on the tire sidewall and turning the wheel if necessary to bring the markings into view Bike Tire Sizes Explained | Michelin USA.
A mm tire may show 37-590, with indicating the tire width in millimeters Current 26″ x/8″ (aka 650A or ISO 590) tire…. The same size family may also appear as 650x37A, where again indicates width Current 26″ x/8″ (aka 650A or ISO 590) tire…. These markings are more informative than relying on the phrase “26 inch” alone.
Pay attention to the exact designation. Schwinn’s ×/8 S-6 size is ISO rather than the British mm size, and the two are not interchangeable Current 26″ x/8″ (aka 650A or ISO 590) tire…. WTB says rims should carry an ETRTO designation, with the first two digits referring to inner rim width Tire & Rim Fit Chart. WTB also describes section width as the most accurate way to determine a tire’s size designation Tire & Rim Fit Chart.
What inflation pressure range should I use for a ×/8 tire?
The 26X1/8 Road Bike Tires listing does not state an inflation-pressure range or maximum pressure for the SIMEIQI model 26X1/8 (37-590) Road Bike Tires with or…. That specification is unavailable in the supplied claims, so I can’t give a supported pressure figure for this product.
A Panaracer Col de la Vie tire is cited with a psi maximum and a reported use range of 40–45 psi, but that is a different tire Current 26″ x/8″ (aka 650A or ISO 590) tire…. I would not transfer that figure to 26X1/8 Road Bike Tires.
Instead, I’d use the pressure marking printed on the tire or the manufacturer’s instructions once available. The absence of a published pressure figure here is a reason to verify the information before riding, rather than treating another model’s rating as a substitute.

Pros and Cons
Pros
- The package is listed as two tires with tire levers 26X1/8 (37-590) Road Bike Tires with or….
- The listing describes a slick tread intended to provide low rolling resistance 26X1/8 (37-590) Road Bike Tires with or….
- The tires are described as foldable and fitted with carbon steel beads 26X1/8 (37-590) Road Bike Tires with or….
- The listing gives a price of $29.99 and shows the product as In Stock 26X1/8 (37-590) Road Bike Tires with or….
Cons
- The listing warns that the tires are not for 37-559 rims, so the product is unsuitable for the common mm 26-inch standard 26X1/8 (37-590) Road Bike Tires with or….
- The exact compatible inner-tube width range is not stated in the supplied claims 26X1/8 (37-590) Road Bike Tires with or….
- The product’s inflation-pressure range or maximum pressure is unavailable in the supplied claims 26X1/8 (37-590) Road Bike Tires with or….
- Changing to a wider tire can create rim, frame, fork or bicycle-specific clearance problems Bike Tire Sizes Explained | Michelin USA Current 26″ x/8″ (aka 650A or ISO 590) tire….
Final Verdict
| Tire designation | Bead-seat diameter |
|---|---|
| English ×/8 E.A.3 26 Inch Bicycle Tires | 590 mm ISO bead-seat diameter 26 Inch Bicycle Tires |
| 26 × 1.75 26 Inch Bicycle Tires | 559 mm 26 Inch Bicycle Tires |
| common mountain-bike 26-inch tire Current 26″ x/8″ (aka 650A or ISO 590) tire… | 559 mm bead-seat diameter Current 26″ x/8″ (aka 650A or ISO 590) tire… |
| Schwinn’s ×/8 S-6 size Current 26″ x/8″ (aka 650A or ISO 590) tire… | ISO Current 26″ x/8″ (aka 650A or ISO 590) tire… |
Key Takeaways
- Check for the 37-590 or mm designation before ordering.
- Do not substitute a generic 37-559 or × 1.75 tire or tube.
- Measure or verify rim, frame and fork clearance before changing width.
- Confirm the tube’s width marking and the tire’s pressure marking from the supplied product information.
- Treat the listed slick tread, folding construction and low-rolling-resistance statement as manufacturer or listing claims, not independent test results.
Frequently Asked Questions
Do bike tires need to be exact size?
Bike tires need the correct bead-seat diameter and a compatible rim width; similar-looking 26-inch labels can refer to different diameters. The ×/8 size uses mm, while × 1.75 uses mm 26 Inch Bicycle Tires.
Is a inch tire the same as a 700c tire?
The supplied sources do not establish whether a 26-inch tire is the same as a 700c tire. They do establish that different tire labels can use different bead-seat diameters, so the ISO marking should be checked before choosing a replacement 26 Inch Bicycle Tires.
What size inner tube should I use for a inch tire?
Use a tube matched to the tire’s mm bead-seat diameter and compatible width marking. The supplied claims do not provide the exact inner-tube width range for this product, so a generic 26-inch tube should not be assumed compatible Bike Tire Sizes Explained | Michelin USA 26X1/8 (37-590) Road Bike Tires with or….
What tires fit inch rims?
Tires marked for the mm bead-seat diameter fit the ×/8 standard, provided the rim width is compatible. A × 1.75 tire uses the mm size and is not interchangeable with mm 26 Inch Bicycle Tires Tire & Rim Fit Chart.
Sources
- 26X1/8 (37-590) Road Bike Tires with or Without Bike Tubes 26×1.3/8 32mm AV Schrader Valve (2026-10-25)
- 26 Inch Bicycle Tires
- Amazon.com: BELL Inertia Road Tire 26" x/8" Black Kevlar : Sports & Outdoors
- Current 26″ x/8″ (aka 650A or ISO 590) tire offerings – Society Of Three Speeds (2020-06-18)
- Bike Tire Sizes Explained | Michelin USA (2026-04-07)
- Tire & Rim Fit Chart
- Tire Size Chart For Bicycle Rims
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