The only listing here that publishes ETRTO, weight and a valve warning
Continental Race 28, 700×20-25, Presta 42 mm (1.65 in), 2-pack
Two Continental Race 28 road tubes for 700×20-25 and 27-inch 630 mm rims, with a 42 mm (1.65 in) Presta valve and about 100 g (3.5 oz) each.
What you are getting
Two Continental Race 28 road tubes: ETRTO 20-622 to 25-630, a 42 mm (1.65 in) Presta valve, about 100 g (3.5 oz) each, butyl. $14.12 the pair.
It is the only listing here that reads like the shelf
The buying advice on this page is to photograph the tire sidewall, because the ETRTO pair is what decides. Continental gives it directly — “Continental lists the range as ETRTO 20-622 to 25-630, so it also covers 25-630 tires on 630 mm (24.8 in) rims” — and then does three more things no other listing in this group does:
- warns about valve length against rim depth: “check that this length suits your rim depth; deep-section rims need a longer valve”
- names its own variants and their trade-off: “its Light and Supersonic versions use thinner material and need more frequent reinflating”
- tells you what to do with the second tube: “fit one and carry one as a spare”
That is a listing written by somebody who expects the buyer to measure.
20-622 to 25-630 is a narrow band, and that is the point
Twenty to twenty-five millimeters of tire width. This is a road tube and nothing else: it will not stretch happily into a 32 mm (1.26 in) gravel tire, and it is far too narrow for the 47-622 MTB tube Continental also makes — which is the tube already published on this shelf under the same brand.
Two Continental tubes, two completely different rims. Read the ETRTO, not the badge.
The 630 mm (24.8 in) rim is an unusual thing to publish
ETRTO 630 is the old 27-inch road standard, not 700C (622 mm (24.5 in)). Continental saying the range “also covers 25-630” means this tube fits a 1970s or 1980s road bike on 27 × 1 1/4 wheels — a genuinely useful fact, since tubes for 630 mm (24.8 in) rims are getting hard to find and most listings do not mention them at all.
The shelf intro gives the rule: 40 mm (1.57 in) is the standard, and a deep-section rim needs more. Forty-two millimeters suits a shallow box-section or a low-profile aluminum rim. On a 40 mm (1.57 in)-deep carbon wheel it will not reach far enough to attach a pump head reliably.
The Ultraverse 700C tube on this page publishes 48 mm (1.89 in), 60 mm (2.36 in) and 48 mm (1.89 in) in three different places. This one publishes 42 mm (1.65 in) once.
Butyl, standard, seamless
“Seamless construction, with a mold-cured vulcanization, to ensure uniform roundness”, and “each and every inner tube passes a stringent 100% quality control inspection”.
Standard butyl, standard weight — about 100 g (3.5 oz) a tube, which Continental takes from its own catalog rather than from the packaging. The TPU tubes the shelf intro mentions are lighter and several times the price; none appeared in the American survey for this shelf.
What is not published
No wall thickness in millimeters, no pressure range (the listing correctly defers to the tire sidewall), and no article number for this two-pack — 0181781 is given as the article for the tube itself, and the published Continental MTB tube on this shelf carries 182181.
Availability
Read on the day this page was built: $14 at the American Amazon shop.
Read from Keepa on the day this page was last revised; stock and price both move without notice.
Prices quoted in this text were read on 2026-10-06. The live price is at the top of the page.
