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Pictures of Shinko 241 2.75 inch (Updated with review)

Dia1Up

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Hey guys!

Just posting pictures of Shinko 241s in the 2.75 inch wide version front and back. There's a surprising lack of photos anywhere online


Keywords for Google:
Ct125 shinko 241 2.75 hunter 125 trail 125 golden boy sr241 sr241s

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Cpd419

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When I wear my Michelins out, which won’t be mounted till probably the end of the summer, I will most probably try them. Let us know how they do on and off road please.
 

dmonkey

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Some of the trouble with search results may be that the tire is called a few different things, Shinko SR241, Shinko 241, many people just call them Shinkos without specifying the model, and they're nicknamed Golden Boy tires. There are a few reference photos buried in this thread though:

Nice setup with the folding crate. If the sound of rocks scraping in the front fender gets to annoy you, you can redrill the factory fender to lift it slightly. If you do that, be sure to remove the drop-down bracket from the horn and reattach the horn without it or that bracket may come into contact with and dent the front fender when forks are fully compressed.

I really like the Shinko SR241s for mixed use riding. They're extremely soft and grippy, at the expensive of having a short tread life. You might get 2k miles out of a rear, but they're also relatively cheap to replace (if you DIY tire changes) when that time comes. The other downside I encountered is that the tread tramlines really bad on grooved surfaces, think rough rain grooves, road construction, and steel grate bridges. Other than that, great tires. There are a few other block pattern trials tires available in 2.75-17 from other brands (IRC, Kenda) and my experience with the IRC ones at least was that they're very similar, just a slightly firmer compound from my test of digging a thumb nail into them.
 

Dia1Up

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BC Canada
Some of the trouble with search results may be that the tire is called a few different things, Shinko SR241, Shinko 241, many people just call them Shinkos without specifying the model, and they're nicknamed Golden Boy tires. There are a few reference photos buried in this thread though:

Nice setup with the folding crate. If the sound of rocks scraping in the front fender gets to annoy you, you can redrill the factory fender to lift it slightly. If you do that, be sure to remove the drop-down bracket from the horn and reattach the horn without it or that bracket may come into contact with and dent the front fender when forks are fully compressed.

I really like the Shinko SR241s for mixed use riding. They're extremely soft and grippy, at the expensive of having a short tread life. You might get 2k miles out of a rear, but they're also relatively cheap to replace (if you DIY tire changes) when that time comes. The other downside I encountered is that the tread tramlines really bad on grooved surfaces, think rough rain grooves, road construction, and steel grate bridges. Other than that, great tires. There are a few other block pattern trials tires available in 2.75-17 from other brands (IRC, Kenda) and my experience with the IRC ones at least was that they're very similar, just a slightly firmer compound from my test of digging a thumb nail into them.

Specifically why I got the 241s was for the super duper soft compound for sure! I'd take more grip over tread life any day, especially given the low cost


Oh I've gone through almost every page of that thread and searches ect, none quite get a good view imo, hence this thread heh
 

Dia1Up

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Alrighty so update. Did the lake trail twice now, and have been riding the 3km to work every day since (yeah.... My commute is REAL short heh). I think it works out to almost exactly 50-50 on/off-road if don't include the test rides I did

The mold nubs in the front tire are still there, only the middle ones on the rear are missing. Probably from me locking and sliding the rear off-road unintentionally. I go down somewhat steep (not terribly steep) but rather loose areas

(side note, the ABS on these bikes is seriously good, if I lean on it hard on loose stuff, I can feel the ABS back off when the front loads up and gets some more traction. And the Trail doesn't even have the IMU like the Grom does afaik. I'm not sure why people would complain about front ABS heh)


Pros:

First things first: Grip. Man. Complete and absolute night and day. I knew the OEM tires were bad (see my "crash" thread) but not thaaat bad. On hard pack dirt, it feels no different than pavement to be honest, it's crazy. Shallow mud.... You hardly even notice anymore, when I would take everything in me to stay upright with the originals (haven't seen deep mud with them yet)

They look amazing. Normally I already get people taking pictures of the bike in public, but now it seems like even more. I generally park directly outside the front door of our little shop, so it's quite fun to watch people walk by do a double take, and even pull out their phone heh.

They float at a much lower speed. The OEs would just pizza cutter in, but these can stay in top. In sand quite nice, pea gravel is actually oddly a bit more difficult in a way. Instead of sinking through to the dirt, they are more likely to float on the marbles. While I feel they are a bit worse on pea gravel, they are significantly more consistent

The extra sidewall, size, and conformity really really smooth out little things. With how little suspension travel the Cubs have.... to helps more than you'd think.



Mid things:

Some say it feels like "riding on sand", it's more like riding on tires that are low, is a better way of describing it. You can feel them flex and move under you on pavement

They are louder than stock... But they really aren't loud if that makes sense

Top speed is a few km/h slower (GPS). Sure these "up" the gearing because they are bigger. But these bikes' top speed aren't limited by gearing as we all already know, 9hp only gets you going so fast. Just super soft rubber and more tread makes for more rolling resistance. I couldn't care less about a few km/h

They are heavier than stock tires. The extra gyro stability can be nice, but also it feels slower to react. (No..... Weight/rotating mass does not affect top speed)


Cons:

As dmonkey said, the rocks in the front fender hurt my soul. These tires really pick up rocks to begin with, and the 2.75 inch versions are so close to the front fender, they just drag along the inside. My poor fender. I don't think I want to raise the fender, I like the look of a low fender (if you are going through enough mud to cake the fender.... You're probably in over your head anyways on a CT)

Mine have a bit of a wobble to them. I've broken and remounted the bead, even over filled to 45 psi to remount, but there aren't "straight". You can feel them wobble, and see the wobble. Not sure if this is normal or not. Tubes should be fine, the front tube I actually put the tube in first. inflated ever so slightly and then mounted the tire, the tube was perfectly inside.

The extra diameter really do make a difference to the speed/torque. Obviously the speedo will read the same, but its slower to get up to speed, and you need to hit the brakes harder than you normally would with the extra leverage they have over the disks (0 Issues with ABS, works just the same)

Tram line is very real. Not just road grooves, but also off-road ruts. Tread aside; If you just hit the edge of a deeper rut, they flex and really pull you in. Almost went down today because of it

Water and gravel splashing. With the stock tires, I could go through surprisingly deep water crossings and somehow stay bone dry. With the 2.75s, I'm getting wet legs in deep rocky puddles now. Also I'm feeling pebbles pinging off my shins, when I NEVER had that before. (partly the fact they throw rocks, but also the width)

With how much rolling resistance they have now, I suspect fuel economy is lower obviously

Size. While I said the increase in diameter is nice for rolling over small things, you really notice the slower acceleration (probably solved with gearing to compensate the diameter), but more importantly braking. I definitely need to use more force with the brakes


Conclusion:

Probably the cheapest, seriously massive, upgrade you can make. It is hard to really convey how much more grip. At $62 CAD a piece, you can afford to blow through them with the safety they offer. (heck my 1/10 racing buggy goes through dirt tires quicker at $60 a set)

However I wouldn't go for the 2.75s like I did. I would stick to the 2.5 inch. Sure the 2.75 offer more "traction", but these stick like Velcro compared to stock. You are so much more limited by the 2.5 inches of suspension travel (after sag) and 1930's tube style dampers than traction at this point. Staying at 2.5 inch wouldn't be an issue. (Other than load ratings? but these are 4-ply, stock IRCs are 2 ply) The increase diameter is more of a Con than it is a Pro (poor fender and brakes)

(side note: is it just me, or does changing CT tires suck more than normal bikes?)
 
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dmonkey

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The gravel spray on your boots and legs from the front tire is something I forgot about. One way to address that is with a larger mud flap behind the front fender:


The tire changing is a nuisance in a few ways. When changing tires by hand I like to use the zip-tie method to avoid pinching a tube, or at home I have a Kauritmoto Tire Mounting Tool that makes it super easy. Other tricks that can help the process are to park the bike with its center stand on a piece of wood so there is more clearance to pull the rear wheel out from the back as otherwise it can be a struggle to get it past the black plastic tail of the factory fender, you can cable tie the rear brake caliper to the swingarm after removal so it stays put, and for wheel re-install a dowel rod can be put through the axle hole to line things up and then replace with the axle as the axle is inserted.
 

Cpd419

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The stock tires on mine have lasted quite well, but they are horrible off road. After these are gone I will never use them again. I bought a nearly new rear for almost nothing when the original wore out because the front was still so good. But I’m tight like that.
 

DeadguyAle

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@Dia1Up
Thanks for the comprehensive write up on the SR241's!
Had decided to go with this tire when I wear the stockers out (at least the rear tire).
After upgrading the front and rear suspension the stock tires were much less problematic so I decided to keep them on for a bit longer.
Really wanted to go with 2.75 but you raise some excellent points around the downside of the increased width and have me thinking that staying with the stock 2.50 width is probably a better choice, other than how good the 2.75 looks on the Trail.
Do admit that for the price I am tempted to just go ahead and make the change over, got 1800 miles on the stock tires and might call it time to move on.
 

dmonkey

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By spec (not real world measurement) the OEM tires are sized at 80mm wide, just over 3 inches. In the real world, knobby trials tires in 2.75" are only slightly wider and taller, due to the tread. Just something to consider with the metric to inch sizes.
 

DeadguyAle

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By spec (not real world measurement) the OEM tires are sized at 80mm wide, just over 3 inches. In the real world, knobby trials tires in 2.75" are only slightly wider and taller, due to the tread. Just something to consider with the metric to inch sizes.
Your response made me curious enough to go put a caliper on the stock tires.
Front and rear measured 3 1/8" inches wide.
Will have to get an accurate measurement on the tire to fender clearance then look at the height differences. Would also like to see some numbers on weight differences between stock and both versions of the SR 241's.
I have gotten very accustomed to getting 120 mpg plus on my low speed gravel travel rides. I am willing to sacrifice a small drop in mpg for better tires but not interested in having rocks dragging on the underside of the finder every revolution and not sold on raising the fender via drilling additional holes in the mount.
Thanks for contributing to the conversation!
 

Dia1Up

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By spec (not real world measurement) the OEM tires are sized at 80mm wide, just over 3 inches. In the real world, knobby trials tires in 2.75" are only slightly wider and taller, due to the tread. Just something to consider with the metric to inch sizes.

Slightly wider yes. Taller, in a more significant way. Even so, that bit of width apparently affects water and gravel splash. Spec shert is hardly ever accurate

Enough to make people raise a fender. Nevermind the things I said about speed, gearing, and braking



I would be curious about the actual measurements of diameter at 30 psi over stock
 
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Dia1Up

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@Dia1Up
Thanks for the comprehensive write up on the SR241's!
Had decided to go with this tire when I wear the stockers out (at least the rear tire).
After upgrading the front and rear suspension the stock tires were much less problematic so I decided to keep them on for a bit longer.
Really wanted to go with 2.75 but you raise some excellent points around the downside of the increased width and have me thinking that staying with the stock 2.50 width is probably a better choice, other than how good the 2.75 looks on the Trail.
Do admit that for the price I am tempted to just go ahead and make the change over, got 1800 miles on the stock tires and might call it time to move on.

0.25 width isn't a big deal, it's only 0.125 per side. The diameter is the killer I think. There are upsides and downsides. I don't know the actual diameter difference specifically, but it's enough to worry about fender clearance.

I will say when watching them while riding, they do flatten out way more than stock too. The contact patch is extra wide. Makes sense give the design of the tires. I do run them slightly higher psi given this

If someone were to worry about and want a larger tire diameter on a Trail 125, I feel like they forget they probably only have 2.5 inches or so of suspension travel after the natorious Honda soft suspension sag.
 
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DeadguyAle

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If you can believe anything that Amazon lists for measurements the 2.75" SR241 weighs 6.4 pounds while the 2.50 comes in at 4.9 pounds.
Diameter for the 2.75 is listed as 22.99", 2.50 is listed as 22.36" on the Shinko website. The 2.75 being .513" taller or .2565" ride height taller. Which also means .2565 closer to the fender. Don't know what that equates to for overall gearing change.
I measured fender clearance with the stock tire at .870", no idea what the stock tire height is but there is not a lot of clearance even in stock trim.
Believe that I have over analyzed this to death but it did make me change my mind and order the 2.50 tires.
 

Rusty Nuts

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NC
How are the 241s on pavement? I’ve had block tread trials universals on other bikes; I found them to be great off-road, but way too squirrelly on pavement, to the point of being scary. I have Shinko 244 dual-sport tires on my Yamaha XT250, and they are a good compromise, way better on the road. So how are the 241s when you get frisky on pavement?
 
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