That road tire tread pattern wasn’t super great on the 8in size. The wear was pretty quick. Not sure if it’s different with the 9in or not.
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A couple guys on Team MAD have been testing a single set of these tires. They have been performing very well compared to the competition. CST is a big company. I have been told the consistency is very good but I have not seen enough sets to confirm that. The only bummer is the tires use a rim size that is slightly different than what most people are using right now.
These tires were performing exceptionally well at our season finals. I’ll be trying a set myself when the weather turns good.
For me the future is still kart tires, I think the size brings benefits, and once everything else is optimized around them, they will probably be the best. But these exway / cst tires do look promising, and probably the best tire that doesn’t require a full new build to get the most out of them.
Unfortunately we couldn’t quite get a fair comparison to the kart tires yet as I was on tires I took from the karting place’s trash.
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Wide 4” hubs are actually easier to get than a wide 3.75 for the supernovas. Are your guys encountering any balance issues with the cst?
Yup, not a lot of wide (>60mm) 3.75in hubs on the market atm. Linnpower wide hubs inner width is 66mm. Old Newbee hubs are ~61-63mm inner width, you can prob find them used. Etoxx and 3DServisas came to mind but haven’t seen parts from them for a while.
As for 4in wide hubs, there are 2 that I know. Linnpower and Newbee (Newbee BlackFriday sale is still there for a couple more days).
Wide hubs availability isn’t great cause their use case is kinda niche.
Edit: @jack.luis and I talked about getting a group buy for his set of hubs. I think it was like +$220 for a set of 4 CNC out of Nylon 6 (supposedly). If we have a couple more orders we could get it down to like $200.
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I snapped up a pair of those newbees on that sale. Really hoping they don’t get discontinued and he sticks with that design incase one or more get damaged.
MBS pro xl is another wide 4
I didn’t realise the linnpower were as wide, I’ve heard they can be a pita with the quick release design though.
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MBS XL’s are 60mm~ and can take 4in tires. Not sure if running a widening spacer is feasible
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Spacers are very feasible on the XL, I have some designed. Though it can reduce the durability of the hub, specifically the bearing seat area.
I’ll try to remember to upload them here tomorrow for anyone that wants to 3D print a set.
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There are spacers on here for MBS RSII XLs. I got most of the way through designing a spacer for Fiverstars and then gave up on it because the tires I was running actually fit on them pretty well after breaking them in on XLs a bit. My plan was to use a 20 mm spacer, which would widen the bearings 20 mm, and then 70 mm axles.
I should probably continue on that project. It was also a bit of a pain in the ass, but I managed to get Fivestars to work tubeless with a liberal amount of silicone and Amazon.com: Partuto 12 Pcs Universal PVR50 Tubeless Tire Valve Stem - Cars RV Bicycles Motorcycles Trailers Tubeless Tire Valve - Stainless Steel Gold Tone : Automotive
MBS Pro II XL actually isn’t that wide. About 54mm inner width for the 4in hub lip. Their new version supposedly a little bit wider but not sure by how much.
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I’ve ran the XLs at up to 88mm width (34mm spacer) on the 4” lips, though I don’t actually recommend that width, at least not with the early batch hubs I had. Granted I had some crashes and did some (minor) jumps with them, but the hubs at that width lasted me shorter time than the tires I had on them. Though I am convinced that those 9x3.5 cst slicks are just indestructible. 700km track and maybe 1.5x as much other riding (which would mostly be high speed carving) and yet to show cords. So around 1600km/1000mi total estimated distance, the most I have in any tire by far. While certainly not ideal that the rims are dead after this much riding (again, with the huge spacer), it lasted me long enough that I feel like I got my money’s worth. I want to mill some new hubs for them myself eventually.
But back the the XLs running reasonable widening (around 15mm) is totally fine, and for 4” ID tires that already a very respectable width.
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Yeah, I was comparing them without spacers.
Where do you get spare tubes for those tire?
Here’s the MBS XL hub spacer files incase anyone wants to print a set.
mbs10.stl (289.9 KB)
mbs15.stl (338.0 KB)
mbs20.stl (348.3 KB)
mbs25.stl (385.3 KB)
mbs10.step (75.9 KB)
mbs15.step (75.9 KB)
mbs20.step (75.9 KB)
mbs25.step (75.9 KB)
Printing and fitment tips:
Don’t use PLA, I’ve had a PLA set melt in the sun. Any other material should be fine. You’ll probably have to drill out the screw holes with a 4mm drill bit. And if the lips don’t snap together easily, I recommend taking a dremel sanding bit and just do a few circles on the printed part to get the fitment right. It’s quite likely that the dremel trick will need to be used, as tolerances vary by printer and material… And it’s designed for quite tight tolerances. If you don’t have a dremel manual sanding with sandpaper can also get the job done but dremel is much faster.
The part should be printed in this orientation without supports, I usually bump up the wall count enough so that it gets to 100% infill with just walls.
Note2:
I’ve not had any spacer related failure / safety issue, and in my testing the spacers hold up better than the hubs themselves if printed well. That said, obviously use at your own risk. However, what I did have is that the hub bearing seats widened over time with the use of big spacers. If you keep spacer width to around 15mm which should be enough for most tires, this shouldn’t be something that happens quickly. For supernovas and linn slicks I found the 15mm spacer to be the ideal width.
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Thanks for posting these. I drew one up but didn’t have a chance to print and test yet; I’ll compare mine and yours. Planning on running the Exway ACE CST 162 tires on the XL hubs so I was thinking around 10mm might be good, but I’ll check.
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I feel like with hubs getting this wide. Double bearing might be good. Plus axle space is also an issue for me.
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As long as there’s proper spacing a single bearing is honestly fine, the issue here moreso is that there isn’t proper spacing.
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