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Merlin Cycles£9.50Visit shop Weldtite Black Self Sealing Inner Tube - / 27.5" / 2.0" / 2.5" / Presta
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The Weldtite Dr Sludge Self Sealing Inner Tube is an essential upgrade for daily commuters and mountain bikers who want to minimize the risk of being sidelined by a flat tyre. Pre-filled with an advanced, non-corrosive sealant, these tubes automatically patch punctures up to 3mm as you ride, offering a set-it-and-forget-it solution for puncture protection. While this provides significant peace of mind on the trail or road, users should note that the added weight of the sealant inside the tube is slightly heavier than standard racing-focused lightweight tubes.
| Model Part Number | TL04026 |
|---|---|
| Brand | Weldtite |
No, the Weldtite Dr Sludge formula is specifically designed not to dry out, ensuring it remains liquid and effective for the life of the tube.
Yes, as long as the tyre width is within the recommended range for the 27.5-inch tube size, it is compatible with most standard bicycle tyres.
Yes, the solution is water-based and non-corrosive, meaning it will not damage the rubber or the structural integrity of your tyre.
While the tubes are slightly heavier due to the pre-filled sealant, the weight difference is negligible for commuting and general mountain biking compared to the benefit of flat prevention.
If you see a small amount of white, liquid residue on the outside of your tyre, the sealant has successfully plugged a puncture you likely didn't even notice.
Check if the puncture diameter exceeds 3mm. If the hole is too large, the sealant cannot bridge the gap and the tube will require replacement.
Ensure the valve core is tightened securely. Wipe away excess sealant and ensure the valve cap is kept clean to prevent buildup.
Installation of the Dr Sludge tube is identical to any standard Presta valve inner tube. Before inserting the tube, ensure the inside of the tyre is clear of any debris or original piercing objects. Always inflate the tube slightly before installing it into the tyre to prevent bunching or pinching. While the sealant is long-lasting, ensure you protect the Presta valve core from clogging by keeping the valve cap on when not in use. If you encounter a puncture larger than 3mm, the sealant will not be able to close the gap, and the tube will need to be replaced, as internal sealants are not compatible with traditional adhesive patches.
