A grip that twists or creeps off the bar needs fixing before your next ride. Park Tool’s repair guide says grips on flat handlebars “should not slip or move during the ride.” The fix depends on what holds the grip on. A slip-on grip relies on being tight, so you clean the bar and re-bond or replace the grip. A lock-on grip relies on a clamp, so you tighten its bolts to the maker’s figure or replace it. Either way, the bar end needs a plug or other cover that stays put.
Slip-on or lock-on: tell them apart first
Slip-on grips hold by a friction fit: the grip is slightly narrower than the bar, so it is stretched on and held by its own tightness. Lock-on grips add a locking collar, usually with one or two small bolts, that clamps the grip to the bar. If you can see a metal collar with hex-bolt heads, it is a lock-on. A smooth sleeve with no collar is a slip-on.
| What you see | Likely cause | What to do |
|---|---|---|
| Slip-on grip twists or slides | Grip expanded with age, or bar is dirty or oily | Clean the bar and refit, or replace the grip |
| Lock-on grip still turns | Bolts under-tightened, or threads stripped | Tighten to the maker’s torque, or replace the grip |
| Bare tube at the bar end | Plug missing | Fit a plug before riding |
Why slip-on grips let go
Park Tool notes that grips tend to expand over time and loosen on the bar. A friction fit is only as strong as the squeeze and the surface it squeezes on, so a relaxed grip, or one on an oily bar, will turn under a firm push. Adhesive can help a grip bond, but grips eventually wear out and should then be replaced.
Refit a slip-on grip
- Remove the bar-end plug. Traditional plugs usually pry out with a small screwdriver. Expansion-style plugs have a bolt you loosen with a wrench first.
- Free the old grip. Use compressed air to open a gap between grip and bar, then twist it off. Or open one end and spray rubbing alcohol inside as a lubricant. Cutting is the last resort and never an option on a carbon bar, because scoring the surface weakens it. If you cannot tell whether your bar is carbon, do not cut.
- Clean the bar with isopropyl alcohol or another nonresidual cleaner.
- Fit the grip. Park Tool describes two routes. Spray alcohol inside the grip and onto the bar, slide the grip on, and wait until the alcohol has fully evaporated before riding, which may take a few hours. Or use adhesive spray or hairspray as the lubricant, which also bonds the grip as it dries; some adhesives need a day or so.
- Refit the plug (details below). Once dry, twist and pull the grip hard before you ride.
Makers do not all agree on method. Renthal’s push-on grips are fitted with grip glue on the bar and inside the grip, and Renthal warns against contact cleaner, petrol (gasoline) or any solvent inside them. Park Tool’s guide uses alcohol as a fitting lubricant instead. If your grips came with instructions or a recommended glue, follow those.
Tighten a lock-on grip correctly
Lock-on clamp bolts are typically 2.5, 3 or 4 mm hex. Use a key that is not rounded and sits fully in the bolt head, because ODI notes a poor fit strips the bolt. Park Tool’s instruction is to tighten to the manufacturer’s stated torque value. Torque is twisting force, measured in newton-meters (Nm); a torque wrench lets you hit a target. The numbers differ a lot between makers:
| Grip | Maker’s own instruction |
|---|---|
| ODI Lock-On v2.1 (3 mm Allen key) | 4.5-5.0 Nm (40-45 in-lbs) |
| Renthal single-collar lock-on | 3 Nm maximum |
| Renthal two-collar lock-on | 2 Nm maximum |
These apply to each maker’s own product, not as a universal spec. ODI adds that the right setting can vary with bar material and diameter, and Renthal warns that exceeding its limits strips the threads, so more torque is not extra safety. Use the figure on your grip’s packaging or the maker’s site; if you cannot find one, ODI advises unsure riders to ask a local bike shop.
- Seat it fully. ODI warns against letting a grip hang off the bar end or extend the bar width, and says a grip not flush to the end can fail and cause injury.
- Clamp every collar. On a two-collar grip, Renthal says both collars must be tightened onto the bar.
- Re-check. Renthal says to check the torque again after 2 hours of riding.
- Retire a grip that will not hold. ODI says not to use grips that stay loose even at the specified torque. Renthal says to replace a damaged grip and not to use its single-collar grip after a crash.
Set bar angle and lever position before clamping anything; the handlebar setup guide covers that. Afterward, squeeze each brake lever and check it moves freely without catching the grip. If it feels wrong, see how to service your own brakes or have a shop check it.
Bar-end plugs: small part, safety item
Park Tool calls bar-end plugs an important part of the bike and a safety item. Fit them after the grips. Most press in by hand; a stubborn one can be gently tapped in with a hammer. For an expansion plug, seat it in the bar and snug the bolt, since many have no torque spec and Park Tool says “snug” is typically enough. Treat a bare tube end as a fault to fix before riding, and add a plug check to your pre-ride checklist.
The US rule: 16 CFR 1512.6(d)
In the United States, the federal bicycle regulation (Title 16 of the Code of Federal Regulations, Part 1512) addresses this directly. In the eCFR text read in October 2026, section 1512.6(d) says handlebar ends must be capped or otherwise covered. It also says handgrips, end plugs, control shifters and other end-mounted devices must stay secure against a removal force of no less than 66.8 N (15 lbf). The test section, 1512.18(c), requires these devices to be tested against the specified removal forces and gives 67 N (15 lbf) for protective caps.
- It covers bikes as sold. Section 1512.3 applies the requirements to a bicycle in the condition in which it is offered for sale to consumers. It is a product rule, not a roadworthiness test for a bike you already own.
- It has exclusions. Track bicycles and one-of-a-kind bicycles, as defined there, fall outside Part 1512.
- It includes some e-bikes. The definition of “bicycle” covers pedal-equipped e-bikes with a motor under 750 W, subject to a separate speed condition. For wider context, see the e-bike laws guide.
- It is US-only. It says nothing about what other countries require.
Stop riding and see a shop if
- A lock-on grip still moves at the maker’s torque, or a bolt turns without tightening. The threads are likely stripped, so replace the grip.
- You cut or scored a carbon bar, or are unsure what the bar is made of.
- The bar shows a crack, bend or deep gouge, or a grip came loose in a crash. A bar is a steering part and needs a professional look.
- No plug fits and the bar end is open.
Sources
- Park Tool: Handlebar Grip Installation (Flat Bars)
- US Consumer Product Safety Commission (via eCFR): 16 CFR Part 1512, Requirements for Bicycles
- ODI: Lock-On v2.1 Installation Instructions
- Renthal: Grip Fitting
Last reviewed: October 2026.