Answer BMX MPH Junior Platform Pedals (Black)

What the Answer BMX MPH Junior is

The MPH Junior is Answer BMX’s small-size flat race pedal: a pinned aluminum platform on a chromoly spindle that turns on sealed cartridge bearings. It is built for smaller riders on BMX race bikes, where a compact platform keeps the foot centered over the spindle and the pins stop it skating off on the gate.

Answer sells it alongside the larger MPH Senior. Retailers list the Junior with 13 removable pins per side, which is a lot for a pedal this size, and with an ultra-low platform profile. On most listings the platform measures 109 x 97 x 16 mm; one retailer lists 99 x 96 x 15 mm, so treat the exact figure as approximate.

Thread check first: 9/16” vs 1/2”

The MPH Junior is listed with a 9/16” x 20 TPI spindle only. That matters more on kids’ bikes than anywhere else, because many small bikes use a different crank:

• Two- and three-piece cranks (separate crank arms bolted to a bottom bracket axle) take 9/16” pedals. Most junior and expert BMX race bikes and nearly all adult bikes use these. The MPH Junior fits.
• One-piece cranks (a single S-shaped steel crank running through a large bottom bracket shell) take 1/2” pedals. Many budget kids’ bikes, cruisers and older BMX bikes use these. The MPH Junior does not fit, and forcing it will ruin the crank threads.

To check, look at the crank: if the arms and axle are one continuous piece of steel, it is a one-piece crank and needs a 1/2” pedal such as the Salt Junior V2.

Setup notes

• Grease the threads on both pedals before fitting.
• Left is reverse-threaded. The left pedal tightens anticlockwise; the right tightens clockwise. Start both by hand to avoid cross-threading (which pedal is reverse threaded).
• Tighten firmly with a pedal wrench or hex key (pedal tools), and recheck after the first session.
• Pins: for a young rider still learning, remove a few inner pins to make repositioning easier and save some shin skin; refit them for racing. See our pedal pins guide.

How it compares

• vs Answer MPH Senior: same concept, bigger platform. The Senior is listed with fewer pins (6 per side). Move up when your rider’s shoes hang well off the Junior’s front and back edges.
• vs nylon BMX pedals like the Merritt P1: cheaper and they skid off crashes, but use molded pins and loose-ball bearings. The MPH Junior is the more serviceable race pedal.
• vs the DMR V8 Classic DU: a 90 x 94 mm die-cast body on DU bushings, also 9/16”, with only four replaceable pins per side; a budget option for teens.
• vs clip race pedals: when a racer is ready for clipless, Answer also makes a junior clip pedal (the Power Booster Jr). Flat pedals are the better place to learn gate starts and manuals.

More options are in our platform pedals guide and flat pedals guide.

Care and wear

Sealed cartridge bearings need little attention, but wash the pedals with low-pressure water rather than a jet wash, which can push water past the seals. If a pedal starts to feel rough or develops side-to-side play, the bearings are due for replacement.

Check the pins after crashes: a bent pin is easiest to remove while its head is intact. Replace pins in matching sets so both pedals grip the same.

Black hides scuffs best. To match blue parts, the same pedal comes in blue; for other Answer parts, see Answer BMX.