Shinko 421 Knobby Tire

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Shinko 421 Knobby Tire

Postby Rye » 10 Feb 2018, 21:58

Has anyone tried the Shinko 421 Knobby Tire? It says made from nylon. https://www.amazon.com/Shinko-Mini-Bike ... QH20WZ4PK1
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Re: Shinko 421 Knobby Tire

Postby Burgerman » 10 Feb 2018, 23:21

Woven nylon casing, also used rayon, and sometimes steel banding. Rubber compound is the bit you drive on. OK for off road, dirt, or grass.
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Re: Shinko 421 Knobby Tire

Postby Rye » 11 Feb 2018, 16:06

Thanks. I've been seeing a lot of scooter tires around but they're all 3.50. Any trouble with them rubbing the motors on chairs? There's not much of a gap between the stock tires and the motors.
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Re: Shinko 421 Knobby Tire

Postby Burgerman » 11 Feb 2018, 16:08

Depends on chair.

If you must you can use spacers. Or wider rims. Or go a fair bit wider such as 100/80, 110/80, or like below 120/70 -8 without big diameter. Like here:

download/file.php?id=7719&mode=view
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Re: Shinko 421 Knobby Tire

Postby tutatu » 11 Feb 2018, 21:41

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Re: Shinko 421 Knobby Tire

Postby expresso » 13 Feb 2018, 03:37

i was considering that tire at one time - i ended up with the same rear tire as BM has - in a 350-8 size - and just changed out the fronts to 300-4

liking the look now -

i inflated them to 19 PSI to start with - seems like it would be more than enough - i may lower it to 15 once i test it

on my chair - on the stock rim - the 350-8 tire fit just right - - no room to spare near the motor - - with no spacers -
i would love to try those rims BM is using a bit wider but not there yet - using stock rims made it easy swap - no work involved -

i believe the size i would need to keep it stock size is 2.5 inch wide ? if i ever went tubeless - is that correct BM ?
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Re: Shinko 421 Knobby Tire

Postby Burgerman » 13 Feb 2018, 03:57

Not sure what yours are now. But the best rim for 3.50 tyre is 2.5J rim to 2.75 width.

To go to the next size up that I have which is 120/70 or to 110/80 - 8 tyres needs a 3.5 rim. Theres loads of 2.5 and 3.5 rims though.
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Re: Shinko 421 Knobby Tire

Postby ex-Gooserider » 13 Feb 2018, 04:22

They are tube-type, so can't be used tubeless safely... They may give a bit extra roughness on the ride as you go from one set of knobs to the next, especially on hard surfaces... OTOH, probably a lot better than the stock in terms of off-road capability.

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Re: Shinko 421 Knobby Tire

Postby expresso » 13 Feb 2018, 04:30

2.5J ? rim size width 2.5

the stock rim says on the side 2.5 -

i dont want my chair any wider than it is already - if i ever even tried that - for me so far its working great this way and i have a decent rim -

this was and is the easiest way for me - tire mounted at bike shop - all i needed to do is mount to chair stock rim - nothing to do - had to just raise the fender
how ever the tech did it - not sure but it worked out just right
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Re: Shinko 421 Knobby Tire

Postby expresso » 13 Feb 2018, 21:04

just added the front tire - Kenda brand 300-4 and they fit !!! - - feels so much better - i took a quick test run in the hallway of my building - hopefully will test it outdoors in the weekend -
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IMG_20180213_113412.jpg
IMG_20180213_112605.jpg
IMG_20180212_181741.jpg
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Re: Shinko 421 Knobby Tire

Postby snaker » 14 Feb 2018, 01:55

I am using these Kenda casters too. They make riding light and easy. The downside is that the caster shake is easier to happen :cussing Therefore the chair needs some fixes and the casters need a low pressure (mine is about 15psi).
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Re: Shinko 421 Knobby Tire

Postby shirley_hkg » 14 Feb 2018, 02:59

snaker wrote:They make riding light and easy. The downside is that the caster shake is easier to happen :cussing





I'll expect wobbly casters at speed on him also . :dance :dirtbike
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Re: Shinko 421 Knobby Tire

Postby Burgerman » 14 Feb 2018, 03:09

Really?

http://www.wheelchairdriver.com/BM3-con ... /15mph.mp4

This is mph not kph... So 24 kph
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Re: Shinko 421 Knobby Tire

Postby expresso » 14 Feb 2018, 03:26

shirley_hkg wrote:
snaker wrote:They make riding light and easy. The downside is that the caster shake is easier to happen :cussing





I'll expect wobbly casters at speed on him also . :dance :dirtbike



Really ?? thats going to suck - i havnt tested it outdoors yet - i put 19 PSI for now - if i have to - i can go lower to 15PSI easy -

i was doing ok with the previous tries - - the forks are the same - rim also - i just went from the 9 inch 280 size to this one 300-4 - it does look huge compared to older tire now -
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Re: Shinko 421 Knobby Tire

Postby expresso » 14 Feb 2018, 03:29

chair is very fast now - motor comp. at 40 gave it a bit more power and i can easily lift up the front end taking off from a flat surface - i have to be extra careful on hills and curb cuts


if its true would be depressing now - looks so much better and feels so much better
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Re: Shinko 421 Knobby Tire

Postby snaker » 14 Feb 2018, 03:30

Mine do not shake on the road surface like in the video. The shake only happens when meeting all of these conditions:
- Horizontal surfaces (I mean one side is higher than the other)
- Some sand or tiny gravel on road
- Speed >= 12kph
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Re: Shinko 421 Knobby Tire

Postby expresso » 14 Feb 2018, 03:32

snaker wrote:Mine do not shake on the road surface like in the video. The shake only happens when meeting all of these conditions:
- Horizontal surfaces (I mean one side is higher than the other)
- Some sand or tiny gravel on road
- Speed >= 12kph



yes i can see that happening when the road is not even on both sides - or when i lift up the front end and comes back down - can be tricky before it sticks

speed can make a difference - going faster lightens the front a bit

on plus side - tire is sticky - good rubber and rounded which makes it smoother turning i noticed this already the moment i sat in the chair and move it -

the squared edged kenda i have before were good also but were sticky when turning slow many times indoors
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Re: Shinko 421 Knobby Tire

Postby shirley_hkg » 14 Feb 2018, 03:40

Burgerman wrote:Really?

This is mph not kph... So 24 kph


The geometry is not right , on his fork .
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Re: Shinko 421 Knobby Tire

Postby expresso » 14 Feb 2018, 04:00

whats wrong with the fork ?

theres nothing that can be adjusted - the fork postion is the only way it would fit

all i did was replace the 280 tire before with this one -
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Re: Shinko 421 Knobby Tire

Postby Burgerman » 14 Feb 2018, 06:09

Mine do not shake on the road surface like in the video. The shake only happens when meeting all of these conditions:
- Horizontal surfaces (I mean one side is higher than the other)
- Some sand or tiny gravel on road
- Speed >= 12kph


Thats caused by CG too high. Happens on my bm chairs too if seating mount is raised by 1 inch. Or if rear tyre pressures not equal. Because in both cases it lifts weight off one caster. And people think they can just add a heavy set to it... :shock:
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