365LikesKyosho MP10T
08-04-2019, 06:17 AM
#18
how about we discuss xrays pinion bearing systems over the years? 3 big bearings used to fail all the time, they changed to smaller and not so many issues 
actually kyosho proved this with the original truggy/ST-RR, the case was soft and warped with the heat of spiral geears, changed to a harder plastic and straight cut evo gears and fixed itself...
actually kyosho proved this with the original truggy/ST-RR, the case was soft and warped with the heat of spiral geears, changed to a harder plastic and straight cut evo gears and fixed itself...
You seem to assume I have some kind of brand loyalty, I don't. That's a great way to be locked into manufacturers' poor decisions.
Xray's 3-bearing design ('08-'10) was terrible - for seat design reasons - not because of bearing size - 4mm section bearings actually have smaller balls, peak bearing ratings are a function of all dimensions not just the OD.
However, Xray learned from their mistake (9 years ago), and from '11-'19 inclusive they use 8x16x5 for all diff pinion bearings. They also ran the same setup on the original XB8 from '04-'06.
Kyosho on the other hand had the right idea from the MP6 days right through to the MP777, but with the latest generations MP9 and MP10 the pinion bearings are undersized and result in either shorter maintenance intervals or faster diff pinion wear. Every brand makes bad decisions - but all that matters is the lessons learned and whether they are applied in the latest iteration.
FYI, The ST-RR you mention is based on the now-ancient MP777 (not MP9), thus 8x16x5 bearings.
The MP10T (if running 5x11x4) will bring new and exciting problems.
Mugen is 6x13x5, Xray is 8x16x5. I'd choose either of these setups over Kyosho, especially for the smaller pinions and higher loads in truggy.
08-04-2019, 09:54 AM
#19
Suspended
Oh dear. Edit, cant be botherd to explain to a brand basher
Last edited by iplaygames; 08-04-2019 at 10:15 AM.
08-04-2019, 03:32 PM
#20
I doubt, explaining the issue at hand constitutes "Brand Bashing"!
Having run the Kyosho's from the MP7.5 - MP9 tki 3, prior to switching back to Mugen. The smaller bearings for the pinion bearing was a bit of a step back, and i did seem to replace more on the MP9's than on previous Kyosho cars, especially when the center universal got bent during a race. And even then I'd go as far as to replace the rear diff housing as well.
Having run the Kyosho's from the MP7.5 - MP9 tki 3, prior to switching back to Mugen. The smaller bearings for the pinion bearing was a bit of a step back, and i did seem to replace more on the MP9's than on previous Kyosho cars, especially when the center universal got bent during a race. And even then I'd go as far as to replace the rear diff housing as well.
08-04-2019, 05:47 PM
#21
How were you possibly bending center unis?
08-04-2019, 08:03 PM
#22
Suspended
Lawn darting which will destroy pinion bearings in any car, i've bought 3 new tki3's over the years and all my pinion bearings have lasted ages, then again neither my boys or me lawn dart.. i've always seen bigger pinion bearing cars have issues, there is a reason for it and its also the same reason alot of brands use small bearings..
*generally* alot of times the size of the bearings have nothing to do with how long they last..
just for a giggle but true in a way - "its not about how big it is, but how well its used"
*generally* alot of times the size of the bearings have nothing to do with how long they last..
just for a giggle but true in a way - "its not about how big it is, but how well its used"
08-04-2019, 08:35 PM
#23
Lawn darting which will destroy pinion bearings in any car, i've bought 3 new tki3's over the years and all my pinion bearings have lasted ages, then again neither my boys or me lawn dart.. i've always seen bigger pinion bearing cars have issues, there is a reason for it and its also the same reason alot of brands use small bearings..
*generally* alot of times the size of the bearings have nothing to do with how long they last..
just for a giggle but true in a way - "its not about how big it is, but how well its used"
*generally* alot of times the size of the bearings have nothing to do with how long they last..
just for a giggle but true in a way - "its not about how big it is, but how well its used"
Say what you will, but Sworkz uses the same 5x11x4 bearing and “my” experience is they fail pretty frequently and require more preventive maintenance periods. This become pretty evident after my first race and rebuild. Since then I have bought an Xray and are still using the original factory bearings on the case and pinion after 5 separate events. Also, These are not some fancy Ceramic bearings either. In my opinion I would say Xray uses some pretty low grade bearings compared to others I have used. Anyhow “size” does matter and I would really be watching them on the mp10t. Bearings aside, I am more amazed they were able to get the Truggy to market this quick after seeing spy shots on Facebook.
This might have something to do with them going bankrupt and getting bought out by a bank that they are needing to bring more products quicker to market.
08-04-2019, 09:43 PM
#24
Suspended
before a major race i changed my pinion bearings on my s35-3(well whole car, with sworkz metal shielded) and they are still in the car, thats 6 months worth and that includes a wet race.. if you're using cheap "$1" bearings theyll go bad whatever car or size they are.
i always use quality bearings and they've never ever failed me, actually i lie - i once used protek bearings in the outside hub of a ST-RR and it blew apart when i got t-boned.
bet you'll be surprised that if looked after and setup properly how long those pinion bearings last.
i always use quality bearings and they've never ever failed me, actually i lie - i once used protek bearings in the outside hub of a ST-RR and it blew apart when i got t-boned.
bet you'll be surprised that if looked after and setup properly how long those pinion bearings last.
08-04-2019, 10:05 PM
#25
Appreciate the backup, clearly plenty of others have been through the 5x11x4 bearings failing.
If you have no point of comparison then of course they will seem "OK", but in the long run with the larger bearings you can drive for much longer before servicing - in an area which takes comparatively more time to service (loctite, reshimming, etc). This thread is about the truggy and I really don't think 5x11 has a place in it, as Mickey says I'd be watching that area carefully on the MP10T. The MP9 / MP10 scrapes by but there's more mass and drivetrain load in truggy.
If you grossly undersize a bearing for an application, it doesn't matter how good it is, there's going to be a ceiling on peak load rating and given the smaller contacting parts, they will wear faster. Blaming driving just reiterates it's a weak point on the car.
I certainly don't think Xray stock bearings are great, but not a fan of Kyosho's metal shields either. Thing is, on any kit you replace them on the first rebuild anyway (or I do), and from that point the kit with the correct bearing sizes will last much longer. FWIW I've been using Mugen kit bearings (8x16) lately, seem OK. Also using Kyosho 7075 hubs/uprights and shock shafts on various cars. Zero care for brand. But I'd never own another 1/8 offroad with 5x11 bearings.
If you have no point of comparison then of course they will seem "OK", but in the long run with the larger bearings you can drive for much longer before servicing - in an area which takes comparatively more time to service (loctite, reshimming, etc). This thread is about the truggy and I really don't think 5x11 has a place in it, as Mickey says I'd be watching that area carefully on the MP10T. The MP9 / MP10 scrapes by but there's more mass and drivetrain load in truggy.
If you grossly undersize a bearing for an application, it doesn't matter how good it is, there's going to be a ceiling on peak load rating and given the smaller contacting parts, they will wear faster. Blaming driving just reiterates it's a weak point on the car.
I certainly don't think Xray stock bearings are great, but not a fan of Kyosho's metal shields either. Thing is, on any kit you replace them on the first rebuild anyway (or I do), and from that point the kit with the correct bearing sizes will last much longer. FWIW I've been using Mugen kit bearings (8x16) lately, seem OK. Also using Kyosho 7075 hubs/uprights and shock shafts on various cars. Zero care for brand. But I'd never own another 1/8 offroad with 5x11 bearings.
08-04-2019, 10:17 PM
#26
