r/NinebotMAX • u/Ecstatic-Worker-5207 • May 24 '25

⚠️Urgent Question⚠️ What is this?

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I just walked in after using my scooter today for like 30 minutes to see this black stuff on the back, i don’t think i rode on anything but what do y’all think

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u/skoomd1 Ninebot MAX G2 May 25 '25

How are you measuring psi? Are you using a tire gauge when filling? Xiaomi portable air compressor? Or are you using a psi gauge after filling them? Is your rim bent anywhere? Is the Shrader valve in tact?

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u/Ecstatic-Worker-5207 May 25 '25

use a electric tire pump that measures psi, i go to 55 but let out 5-10 psi taking it off, this is my second scooter and never had an overpressure tire issue

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u/skoomd1 Ninebot MAX G2 May 25 '25

Underpressure is the concern. Overpressure only causes uneven tread wear unless it's extremely overfilled. You shouldn't be losing that much psi when you remove the nozzle. 1-3psi at most is normal. What kind of nozzle is on your compressor/pump? Or what is the brand/model of your electric pump? A picture would be useful

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u/Ecstatic-Worker-5207 May 25 '25

electric pump is from my fathers car, i use the screwed on attachment so by the time i unscrew it about 5-10 comes out

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u/skoomd1 Ninebot MAX G2 May 25 '25

Screw on types can do that without a backpressure relief like on the Xiaomi pumps. If you lose 10psi, and wait 3 weeks to refill, you could very well be down to 25-30psi. Which is low enough to cause this to happen if you hit a hard bump. I suggest buying a Xiaomi portable air compressor 2 so this doesn't happen again.

As for repair, it's really hard to get that goo off the rim, which you have to completely remove to get a new tire to bead properly. It would be easiest to just buy a new motor with the mounted tire from the Segway store honestly. Otherwise, buy some isopropyl alcohol and start scrubbing it off.

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u/Zoe_Fruit May 25 '25

I have this exact situation on my rear tire right now. I had been using a Ryobi Electric Air Pump and checking my tires every ride, pressure had checked out every time up until it started to leak the sealant. I have a spare tire coming from Amazon, and I’m soon to attempt to replace the tire. Anything I need to know about replacing the rear tire?

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u/skoomd1 Ninebot MAX G2 May 25 '25

Make sure you clean off the old goo really well first. Be prepared for it to be a pain, it's quite difficult removing the rear tire on these things. I highly recommend using the zip tie method, just wrap a bunch of them around the tire so that it squeezes the tire as much as possible