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I brought the grom to its first kart track with stock everything and ran 29f/25r hot and had this wear. The tires are pirelli rosso. I wasnt pushing too hard, knee down at some sweeping turns but not everywhere. I def need track tires, feel was a bit lacking although grip was ok, never slid. What do you think? Should i lower the pressure?

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I brought the grom to its first kart track with stock everything and ran 29f/25r hot and had this wear. The tires are pirelli rosso. I wasnt pushing too hard, knee down at some sweeping turns but not everywhere. I def need track tires, feel was a bit lacking although grip was ok, never slid. What do you think? Should i lower the pressure?
 

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Just took an spirited street ride with power pure rear because my Mitas rear tire was worn.

Waiting on TT93 rear to try.

Power pure tires have much less grip than the Mitas. I was skidding more than I like using the rear brake.

Mitas is is a completely different class. Way superior for performance riding.
 

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Pard, have you tried the Kenda Kwick KD1 tires? If you haven’t, maybe give them a try sometime. I would love to hear your thoughts on how they compare to the Mitas and Dunlop.

The Kendas are pretty cheap. I just scored another set of them for $89 shipped. Some people have found much better deals than that. They are substantially lighter than the stock IRC tires that came on the bike. I really like them. They don’t last real long, but the performance is great. I don’t worry about the lack of longevity since they are so cheap.
 

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Pard, have you tried the Kenda Kwick KD1 tires? If you haven’t, maybe give them a try sometime. I would love to hear your thoughts on how they compare to the Mitas and Dunlop.

The Kendas are pretty cheap. I just scored another set of them for $89 shipped. Some people have found much better deals than that. They are substantially lighter than the stock IRC tires that came on the bike. I really like them. They don’t last real long, but the performance is great. I don’t worry about the lack of longevity since they are so cheap.
Have not tried them yet. Glad to hear your recommendation. Been considering them. Maybe next tire change?

Really liking the TT93 rear BTW. Maybe even more than the Mitas. Harder to mount though. Stiffer sidewalls.
 

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Sadly, that's not an isolated thing. The entire industry has struggled with supply chain for the last year and a half. I'm talking to an insane level.... As for this tire, we have the fronts in house, with rears expected in September. Sounds horrible, but that's more common than not nowadays....
 

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Have not tried them yet. Glad to hear your recommendation. Been considering them. Maybe next tire change?

Really liking the TT93 rear BTW. Maybe even more than the Mitas. Harder to mount though. Stiffer sidewalls.
Maybe I’ll try the KD2 someday. Sounds like a winner.

Yeah, I’m just curious how the KD1s stack up against track favorites like the Mitas and Dunlop. I’m impressed with the quality of the Kendas, especially for the money. Years ago I didn’t really think of high quality when I heard the Kenda name, but that has changed. They seem to produce some pretty nice stuff, even in the bicycle world.
 
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I just swapped over to a 100 front and a 120 rear, both kd1's. I feel it made a huge difference in how the bike handles.
Is the cross section more round? I can’t remember. I’ve heard that is better for the track. I’m running stock sizes.
 

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Is the cross section more round? I can’t remember. I’ve heard that is better for the track. I’m running stock sizes.
Yeah... I felt like the bike was more stable mid corner, but I really need to get some miles on them before I will know if I like them. I haven't done a track day recently either, but hopefully I'll get back out there soon.
 

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Pard, have you tried the Kenda Kwick KD1 tires? If you haven’t, maybe give them a try sometime. I would love to hear your thoughts on how they compare to the Mitas and Dunlop.

The Kendas are pretty cheap. I just scored another set of them for $89 shipped. Some people have found much better deals than that. They are substantially lighter than the stock IRC tires that came on the bike. I really like them. They don’t last real long, but the performance is great. I don’t worry about the lack of longevity since they are so cheap.
Ordered a set of the KD1s to try.

500 miles on the TT93 rear and it is toast already. Great grip but not a street tire at all. Not for me at least. Way too soft.
 

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Ordered a set of the KD1s to try.

500 miles on the TT93 rear and it is toast already. Great grip but not a street tire at all. Not for me at least. Way too soft.
If you think about it and if you have a scale, weigh the KD1s and the worn TT93. I’ve heard the TT93s are heavy. My KD1s were 3/4 pound lighter each, than the used stock IRC tires. That is a big, noteworthy, useful difference, especially considering it is un-sprung, rotating weight. I’ll take weight savings like that all day long.

I’m very interested to hear what you think. I’ve always wondered just how much better the track tires are. Since you have experience with them, your opinion will be welcome to hear. I hope the KD1s are at least somewhat close to the others.

I need to pick up another rear KD1. The rear tires wear out faster, of course. My front one still looks good. If I had an additional rear, I could install it and that would leave me a complete set in reserve. I would have ordered two rears and a front at the same time, but they only had one of each in stock.

If you end up liking the KD1s, maybe you will try the KD2s sometime too.
 
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Here are some tire weight comparisons.

The Kenda K-1 rear is very very heavy. Kenda front is also overweight. Kind of offsets the benefit of my carbon wheels. Not thrilled.

REAR

Kenda K-1 120/80 -12 rear :
9lbs 7 ounces (new)

Mitas MC35 medium 120/80-12 rear :
7lbs 10 ounces (worn)


FRONT

Kenda K-1 100/90 -12 front :
7 pounds 9 ounces (new)

Power Pure 120/70-12 front:
6 pounds 11 ounces (almost new)

Mitas MC35 soft 100/90-12 front :
6 pounds 7 ounces (worn)

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I didn’t know what sizes you have been running, but I did know that the 100 front and 120 rear sizes weighed more than the stock sizes. I am surprised they weighed that much more, though. I had no idea the Michelin Power Pure tires were so light. Did you weigh the Dunlop TT93? I’m guessing the Mitas tires are not DOT approved? Good grief, your rear Kenda KD1 120/80-12 is a boat anchor.

None of my Kenda tires have that red logo. I thought that was old and they stopped doing it. I went and looked at my actual photos. Here is what mine weighed in stock sizes. Considering the IRC tires were both used, especially the rear, I probably saved about 1 1/2 pounds total in tires alone. Probably close to 3 1/4 pounds total with other components I listed below. The GromFatherz Hyper Hub weighs a bit more, but it is blingy, beautiful, and strong.

Kenda KD1 120/70-12…..7lbs 5oz (new)
Mounted Weight…..14lbs 1oz

Kenda KD1 130/70-12…..8lbs 2oz (new)
Mounted Weight…..16lbs 7oz

IRC NR77U 120/70-12…..7lbs 12oz (used)
Mounted Weight…..14lbs 8oz+

IRC NR77U 130/70-12…..8lbs 13oz (used)
Mounted Weight…..17lbs 3oz

Just for fun, here are some additional weights for other components that contribute to unsprung weight, much of it rotating weight.

Stock Axle Spacers
Front: 138 grams
Rear: 151 grams

GromFatherz Speed Spacers
Front: 44 grams
Rear: 49 grams

Stock Brake Rotors
Front: 734 grams
Rear: 640 grams

EBC Vee Rotors
Front: 654 grams
Rear: 553 grams

Stock Rear Cush Drive Hub: 493 grams

GromFatherz Hyper Cush Drive Hub: 541 grams

Stock 34t Rear Sprocket: 530 grams

Kitaco 34t Rear Steel Sprocket: 304 grams

Stock 15t Front Sprocket (sprung, rotating weight, with retaining plate): 117 grams

Kitaco 15t Front Sprocket (sprung, rotating weight, with retaining plate): 96 grams
 

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I didn’t know what sizes you have been running, but I did know that the 100 front and 120 rear sizes weighed more than the stock sizes. I am surprised they weighed that much more, though. I had no idea the Michelin Power Pure tires were so light. Did you weigh the Dunlop TT93? I’m guessing the Mitas tires are not DOT approved? Good grief, your rear Kenda KD1 120/80-12 is a boat anchor.

None of my Kenda tires have that red logo. I thought that was old and they stopped doing it. I went and looked at my actual photos.

...
Why would smaller 100/120 tires weigh more than the stock larger 120/130 tires?

Did not weigh the TT93 yet, still mounted on the bike.

The Mitas MC35 are DOT tires. Great tires but the medium rear wears flat in the center after less than 1K road miles.

The Kenda is a fresh tire, made in 2021. Not sure why some would have a red logo and others not.
 

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Why would smaller 100/120 tires weigh more than the stock larger 120/130 tires?

Did not weigh the TT93 yet, still mounted on the bike.

The Mitas MC35 are DOT tires. Great tires but the medium rear wears flat in the center after less than 1K road miles.

The Kenda is a fresh tire, made in 2021. Not sure why some would have a red logo and others not.
Good to know about the Mitas. Maybe, I’ll try those someday, too. I think they cost quite a bit more than the Kendas, if I remember correctly. The red logo thing is strange. Yeah, none of my 120/70 or 130/70 tires have it.

As far as the weights go, I felt that the 120/70 and 130/70 Kenda’s weights were pretty reasonable and a good bit lighter than stock, which I welcome. I like the compound. I’m not sure how Michelin makes the Power Pure so light. They must be thinly constructed, but it is a great tire. I think everyone is in agreement that they don’t provide the amount of grip that the Kendas do. I’d personally rather ride on high grip, low mileage tires. I feel safer, when riding fast.

I’m guessing it is the height of the 100/90 and 120/80 that contributes to the additional weight? Would running stock sizes be out of the question for you? Maybe stock sizes would be a good compromise, regarding weight, if they lasted longer than say the Dunlop or Mitas tires. If you keep this set of Kendas, maybe you can at least get some miles out of them. Ultimately, I suspect you will prefer something else, due to the weight penalty alone. It will be interesting to see where the Dunlop TT93 comes in regarding weight.

Realistically, I’ll probably keep running Kendas for a while. I love the grip and the price. I paid $89 shipped for this pair. My mountain bike tires cost that much each…lol.

I saw a YouTube video once where a guy was at a Grom meetup in the Smokey Mountains. Kenda was there with a tent setup. I believe that guy paid $20 a tire for KD1s. How do you beat $40 for a set of great performing Grom tires?

I wonder if the Kenda KD2s are any lighter?
 
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I'm not sure if they're even available for the US market but has anyone tried the Rosso Scooter SC? It's supposedly the same carbon black based compound as a supercorsa.

90575
 

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If you click the “+” beside Technical Specifications, you can view the weights that Kenda claims. Looks like the KD2s weigh even more than the KD1s. I need to weigh my newest set of KD1s, but they are currently in storage. If I get an opportunity, I’ll weigh them and post their weights vs my first set.

KD1s

KD2s
 
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