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8 in. Pneumatic Wheel Kit
am-0970
$37.00
Here is a high-traction wheel which includes a grippy rubber tire, an pneumatic inner tube, and a strong plastic hub. These parts are shipped to you in kit form. The unique aspect about this produc...Read More
Product Overview
Here is a high-traction wheel which includes a grippy rubber tire, an pneumatic inner tube, and a strong plastic hub. These parts are shipped to you in kit form. The unique aspect about this product is the competition-ready hub. The hub accepts any 200x50mm tire and inner tube, 1.125 in. (outside diameter) ball bearings (2 per wheel are needed), and the mounting holes needed to install hardware to be sprocket-driven or hub-driven. This wheel ships as a separate tire, inner tube, and hub halves. Assembly is required.
Important Notes:
RPM Rating and notes:
These wheels are designed to be propulsion wheels for driving a robot or wheel chair. The design intent is to be contacting the ground, being driven by a gearbox at a maximum speed of approximately 500 rpm (which results in 17 feet/sec).
Within some applications, this wheel has been used as a shooter of objects, spinning at a very high rpm. For these applications, a higher rpm shows that the wheel may wobble, since the valve stem is mounted off to one side of the center of the wheel hub. We have seen properly balanced wheels, using securely mounted hardware (longer screws, washers) that can handle 5,000 rpm. When spinning this wheel at speeds up to 5,000 rpm, please take proper safety precautions.
Usage:
With Axle and Hub:
Important Notes:
- Diameter: The nominal diameter for this wheel is actually 7.65 in. when inflated normally.
- Tube pinching: When assembling the tube within the two hub halves, be careful not to pinch the tube rubber between the plastic hub halves. If assembled with the tube pinched between the hub halves, the tube may puncture and leak.
RPM Rating and notes:
These wheels are designed to be propulsion wheels for driving a robot or wheel chair. The design intent is to be contacting the ground, being driven by a gearbox at a maximum speed of approximately 500 rpm (which results in 17 feet/sec).
Within some applications, this wheel has been used as a shooter of objects, spinning at a very high rpm. For these applications, a higher rpm shows that the wheel may wobble, since the valve stem is mounted off to one side of the center of the wheel hub. We have seen properly balanced wheels, using securely mounted hardware (longer screws, washers) that can handle 5,000 rpm. When spinning this wheel at speeds up to 5,000 rpm, please take proper safety precautions.
Included Items:
- Tire for 8 Inch Pneumatic Wheel (Metric Size 200x50mm)
- Inner Tube for 8 Inch Pneumatic Wheel, with 90 Degree Stem (for 200x50mm Tire)
- Hub Assembly for 8 inch Pneumatic Wheel, which includes two (2) black plastic hub halves and six (6) 4-40 x1 Pan Head Phillips thread rolling screws
NOT Included Hardware:
- Bearings
- #10 Screws and Nuts Needed to Mount a Hub (2 Inch Long Screws are Needed) or a Sprocket (2.25 Inch Long Screws are Needed)
- Aluminum Hub, if Driven by a Shaft
Wheel Structure:
The hub halves are held together with the #4-40 screws. This wheel can accept #10-32 screws for mounting sprockets or hubs, but these are NOT included since different length screws are needed to mount hubs or sprockets. These #10 screws can be mounted to the included 1.875 inch diameter bolt circle. The hub halves need to be assembled together so that the valve stem clearance holes line up. Locating features are present for easy alignment.Usage:
With Axle and Hub:
- In order to drive this wheel with a hub, use Hardware Kit 11, which includes #10-32x2 screws (6) and #10-32 nylock nuts (6)
- In order to drive this wheel with a plate sprocket, use Hardware Kit 12, which includes a 550 Sprocket Spacer, #10-32x2.25 screws (6) and #10-32 nylock nuts (6).
- Two (2) bearings are needed for this wheel, if being driven by a sprocket. Use bearings with a 1.125 inch outer diameter. No flange is needed on either of the bearings.
- If you want to let this wheel spin without being driven, you will need to install two (2) bearings with 1.125 inch outer diameter.
Specifications
- Bolt Pattern: 6 holes, 0.20 diameter on 1.875 in. diameter bolt circle
- Bore: 1.00 in. thru hole, with 1.125 in. x 0.375 in. deep bearing pockets
- Diameter: 7.65 in.
- Load Capacity: 120 lbs
- Material: black polycarbonate, gray rubber
- Maximum Pressure: 35 psi
- Tread Width: 2 in.
- Valve Stem: The valve stem may stick out up to 0.375 in. from hub
- Weight: 1.13 lbs
- Width Across Middle: 1.8 in.
Documents
Guide(s)
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Returns
Returns are accepted within 30 days of purchase.
View our return policy here.
Recommendations
52 reviews
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Great Quality. Product as expected. Highly sati...
Great Quality. Product as expected. Highly satisfied.
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Excellent way to improve traction
Also reduces impact loads to chassis. Running a #4-40 tap through screw-mounting bosses will eliminate assembly concerns. Durable and reliable, but nice to have a spare in the event of a catastrophic decompression.
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Review
4 Stars
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Review
5 Stars
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Review
5 Stars
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stripped screw heads
screws stripped easily
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right product
fast delivery
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"Review"
"5 stars"
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Don't forget about the Valve Stem
We forgot to account for the valve stem. This really adds at least 1/4" to the width of the tire.
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Review
As usual, exactly what was ordered and processed / delivered very quickly.
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Excellence in Delivery
Being new to the FRC thing this year I am learning the ins and out of ordering for my team. Having the ability to have parts shipped directly to competition is a service that I truly enjoy. The parts were delivered on Thursday as promised and all was well.
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"Excellence in Delivery"
"Being new to the FRC thing this year I am learning the ins and out of ordering for my team. Having the ability to have parts shipped directly to competition is a service that I truly enjoy. The parts were delivered on Thursday as promised and all was well."
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8 inch Pneumatic wheel
5 Stars
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amazing customer service!!
The customer service at AndyMark is the most thorough I have encountered. I ordered wheels for my daughter's robotics team, and another parent had also placed an order. The customer service team worked very hard to find a solution, even though my order had already shipped. It required a bunch of phone calls, emails, and adjustments, but they were determined to help us, Thanks so much!
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"amazing customer service!!"
"The customer service at AndyMark is the most thorough I have encountered. I ordered wheels for my daughter's robotics team, and another parent had also placed an order. The customer service team worked very hard to find a solution, even though my order had already shipped. It required a bunch of phone calls, emails, and adjustments, but they were determined to help us, Thanks so much!"
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PNeumatic Wheel
Thanks for quick shipping
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pneumatic wheel
Was surprised to find they needed to be assembled.
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"8 inch Pneumatic Wheel"
"The wheels arrive unassembled. Students need to be reminded that using a screw driver to pry the tire onto the hub can damage the inner tube. When carefully assembled and properly inflated the wheels perform very well. Max pressure listed on tire is 36 lbs. 25 pounds works well for us."
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8 inch Pneumatic Wheel
Shipment was on time. No problems
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"Awesome as flywheels"
"Used these in 2013, still using the counter weighted assembly for prototyping into 2016. The grip is perfect for a single or double flywheel shooter."
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Keep Going and Going
We put a pair of these on our frisbee shooter for Ultimate Ascent, and they're still going. We bought these six to support our air cannon. We tried to make our own hubs, but it doesn't take much wobble to make a drop center act flat.
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8" Pneumatic Wheel
Item packed and shipped in good condition and product is exactly as described
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"mixed"
"The tire seems fine, the tube had problems, the hub looks a bit flimsy - will see how it holds up. The biggest issue is the tube. It did not hold air straight out of the box. I tried to reseat the valve core, but this did not help. Only after replacing the valve core did the leak go away or at least get reduced significantly. The tube itself also looks like it will not stand up to long-term use."
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Review
5 Stars
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Review
5 Stars
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"bon"
"bon"
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they were wheels
yup they were wheels
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Review
5 Stars
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Review
5 Stars
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wheel
5 Stars
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Review
3 Stars
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Review of 8 inch Pneumatic Wheel
5 Stars
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Pneumatic wheels
If you are going to use these in the drive system, get several since the tread wears down very quickly. Also, one inner tube was shipped with a leaky valve which and went flat overnight.
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Review
5 Stars
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Wheel was excellent
This wheel was what we ordered. We did not use it on the robot so we don't know how it works.
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"decent but not great"
"For the price of this wheel I expected a bit more quality. The tire quality is fine but the tube and hub leave something to be desired. The hub is split and assembles with 6 screws (3 on each side). These screws are cheap and strip reletivly easily, for the amount of force you have to put on them. Would recommend changing to a more robust hex head screw. As for the tube. The stem does not fit properly in the space provided. The valve stem is bent awkwardly in the wrong direction. This forces it to rest tightly against the hub, thus putting stress on the tube while also making it difficult to access with a compresser nozzle"
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Wheels
We only ordered the wheels because they already have hubs that go with the bearings we have from previous kits of parts.
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Review
The actual tires are not as uniform in composition as they could be. Tthere is enough irregularities that it makes them difficult to balance.
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Review
5 Stars
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Review
Love the wheels but had the valve pop into the tire during testing. Probably needed more air pressure.
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Fast and Friendly
Fast Delivery even in the hecticness that is FIRST.
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Nice and bouncy
This wheel has a decent fit, and the hub design is rather clever. It is rather unbalanced due to the valve stem, and there's no easy way to attach balance weights except to use double-sided foam tape.
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It's OK but should come with instructions
This wheel should come with instructions, considering the intended market. (1) To mount the tire onto the beadseats, the tire should be lubed with soapy water. (2) The outer bolt circle, likely intended to prevent personal injury caused by tire inflation for a wheel that is removed from its vehicle attachment, MUST be installed, and if the wheel is to be disassembled to remove a tire, all inflation pressure must be relieved prior to removal of these important screws.
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"review of pneumatic wheel"
"excellent wheel, easy to install (except for tube, but once you do one it gets easier) nice looking too"
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Review
have not had a chance to use yet
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AndyMark 8 inch Pneumatic Wheel
A great wheel for FIRST robots. Grippy, compliant and relatively light (given the performance). We are using three on our robot. Why three? Wait and see.
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Review
5 Stars
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Review
3 Stars
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Review
4 Stars
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Am-0970
Ok
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wheels
Completely satisfied with the product. Shipping took longer than expected.
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Review
4 Stars
