Ring RTC4000 Cordless Tyre Inflator: Specifications and Safety Notice
At a glance
- What it is: A cordless, rechargeable tyre inflator from Ring Automotive with a digital display and automatic stop.
- Key specifications: 2 × 2500 mAh lithium-ion batteries; 120 W; 0.95 kg; 166 × 112 × 90 mm; rechargeable by USB-C or 12V DC cable (Ring product page).
- Suits: People who want to top up car, motorcycle or bicycle tyres without a cable across the vehicle.
- Skip if: You need a confirmed run time per charge: we found none on the pages we read.
We haven’t tested this product ourselves. This page summarises the manufacturer’s specifications and a small sample of published owner feedback, checked 18 October 2026.
Specifications
| Specification | Detail | Source |
|---|---|---|
| Model code | RTC4000 | [1] |
| Type | Cordless rechargeable tyre inflator | [1] |
| Dimensions (H × W × D) | 166 × 112 × 90 mm | [1] |
| Weight | 0.95 kg | [1] |
| Power | 12V DC or 7.4V DC input; 120 W | [1] |
| Battery | 2 × 2500 mAh rechargeable lithium-ion, included | [1] |
| Charging | 1 m USB-C cable included; 3 m 12V DC cable for use when the battery is flat | [1] |
| Display and memory | Backlit digital display; stores up to 4 pressures in PSI, BAR or kPA | [1] |
| Auto-stop | Yes, at the set pressure | [1] |
| Deflator valve | Yes | [1] |
| Hose | 60 cm, stored on the unit | [1] |
| Adaptors | 3, for bikes (including Presta) and small inflatables | [1] |
| LED light | Built in | [1] |
| Ring’s inflation claim | 13-inch car tyre from flat to 35 psi in under 3.5 minutes | [2] |
| Ring’s inflation claim | 15-inch tyre from flat in under 6 minutes | [1] |
| Maximum pressure | 0 to 120 PSI (0 to 8.3 bar) | [6] |
| Noise rating | 90 dB; Ring advises hearing protection | [6] |
| Guarantee | Not verified for this product | [2] |
The inflation times are Ring’s own claims, not checked by us. Ring’s user instructions print the product size as 95 × 61 × 150 mm, which differs from the 166 × 112 × 90 mm on its web page (possibly because the web figure includes the case). We cannot say which applies.
What owners report
Based on one forum thread (six posts) read on Triumph Motorcycle Forum on 18 October 2026. This is a very small sample, so treat it as a pointer rather than a pattern.
- One poster described the build as solid and said it charges over USB-C, with the hose and valve adaptors stored behind a flap.
- The same poster said, after about six months of use, that they were still satisfied.
- Another poster said theirs worked well and that they had added an extension hose with a clamp-on connector.
We did not read retailer reviews, so we cannot say how common faults or complaints are.
Known issues and safety
Recall check: we searched GOV.UK product safety alerts, reports and recalls (Office for Product Safety and Standards) for “Ring Automotive RTC4000” and “Ring Automotive inflator” on 18 October 2026. No notice names the RTC4000 [3].
Related notice: in July 2025 a recall was published for the Ring Automotive RTC6000 / RETC6000 cordless tyre inflator, because of a fault in the lithium-ion battery protection circuit that could cause overcharging and a fire risk [3]. Ring’s own notice says certain batches of the RTC6000 are affected and tells owners to stop using them [4]. That notice is for a different model. Check the model code on your unit before assuming it does not apply.
Ring’s user instructions rate the noise at 90 dB and advise hearing protection. They point to Ring’s general safety documents for the full list of warnings, which we did not read [6].
Questions people ask
Can it inflate motorcycle and bicycle tyres?
Ring says it is for car, motorcycle and bicycle tyres and small inflatables. It includes three adaptors, including one for Presta valves [1].
Is the RTC4000 affected by the Ring inflator recall?
The recall we found names the RTC6000 / RETC6000, not the RTC4000 [3][4]. Check the model code printed on your unit.
What is the maximum pressure?
Ring’s user instructions give a pressure range of 0 to 120 PSI (0 to 8.3 bar) [6]. Check the figure in your vehicle handbook.
Can I use it when the battery is flat?
Ring lists a 3 m 12V DC cable for use when the battery is not charged [1].
Alternatives
- Ring RTC6000: Ring’s larger cordless inflator. It is the model named in the 2025 recall, so check batch details with Ring before considering one [3][4].
Our verdict
Based on the evidence, this suits drivers, riders and cyclists who want a compact cordless inflator and accept that its run time per charge is not confirmed here. Look elsewhere if you need that figure before buying. This is a research summary, not a test result.
Sources
- RTC4000 Cordless Rechargeable Tyre Inflator, Ring Automotive, www.ringautomotive.com. Checked 18 October 2026.
- RTC4000 Cordless Rechargeable Tyre Inflator, Ring Automotive shop, shop.ringautomotive.com. Checked 18 October 2026.
- Product Recall: Ring Automotive Cordless Tyre Inflator (2507-0008), Office for Product Safety and Standards, GOV.UK, www.gov.uk. Checked 18 October 2026.
- RTC6000 Batch Recall notice, Ring Automotive, www.ringautomotive.com. Checked 18 October 2026.
- Ring RTC4000 Cordless Tyre Inflator (forum thread), Triumph Motorcycle Forum, triumphmotorcycleforum.com. Checked 18 October 2026.
- RTC4000 user instructions (PDF, 8 pages), Ring Automotive, www.ringautomotive.com. Checked 18 October 2026.