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Haven't seen too much detail on these beyond the initial announcement of the junit line.

Ordered some for my son (4) and they got in last night, just in time for the MTB Skills clinic we had scheduled for today. Had some severe thunderstorms roll in partway through so we didn't get in a lot of riding, but it was at least enough for him to decide that he really likes them.

My observations / first impressions:
  • There are markings for cutting down to 600mm in 10mm increments, but you can safely cut down as far as 580mm. Going further is doable but would require cutting length from the brake / shifter clamp area on the grips.
  • Specs say 245g, but ours measured 260g for the bars and 71g for the grips. Bars were 240g after cutting down to 580mm.
  • They're super thin, even compared to the 19mm stock bars on the Yoji 14. They really do look like bars made for kids hands.
  • With the narrower diameter, I was able to adjust the reach for the brakes in a bit more, which helped with the fit.

We did run into one issue during the install:

The grips are held on by both the brake / shift levers and a VERY tiny screw on the end. The screws use a 2mm Allen wrench. Unfortunately our grips either came missing the screw on one side or my son lost it playing with the grips while I was cutting the bars (pretty high chance it was the latter). Either way, the screw was nowhere to be found on the workbench or floor.

I did some looking around to come up with a substitute and came across some small but hollow screws from an Avid bleed kit that fit. First one I tried snapped in half when I tried to tighten it down as much as the stock screw, but I was able to back it out by applying a little pressure to the end with a 1.5mm Allen wrench. Second attempt I was able to get one tight enough to be confident that the cap at least won't fall off - with the brake lever holding on the other end, we should be OK for now.

Reached out to Hayes support to see about replacement screw(s).
 

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My son thought they felt really weird at first after riding adult grips for so long, but he prefers them now. I do wish they had used a 2.5 mm screw for the clamp like most lock-ons do. It's a fine line between getting the 2 mm tight enough and stripping it.
 

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My son thought they felt really weird at first after riding adult grips for so long, but he prefers them now. I do wish they had used a 2.5 mm screw for the clamp like most lock-ons do. It's a fine line between getting the 2 mm tight enough and stripping it.
Any advice on where to get them? Everywhere we look they are out of stock. We are building a 24" Kotori and this is the missing piece!
 

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MTB Dad
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I put some on my daughter's (4) Norco Charger about a month or so ago - forgot to post on here. They made a huge difference for her after I cut them to about 600mm.

I was really impressed how much closer I could adjust the brake lever too, I guess I though about it but didn't really consider how much of a difference it would make.

My son (6), who has been shredding on his Flow for over a year now, didn't like them however. I think he's too used to regular sized bars since he's been racing BMX and riding MTB and park.
 

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Got the new bigger ones. The small ones are 22 OD, the new 27 OD and the next step for adult size bars 29 OD. Happy to have this option now, the jump from 22 to 29 is big, whenever I ask my kid if he's ready to go larger he said no. Also nice is thicker padding.
Shadow Iron Cylinder Brick Carbon
 

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I just gave it a try with some spongy bar tape and it's a spongy feel. Even with a tight wrap it's measuring 29+. With the many options in bar tapes it's certainly a good suggestion but my vain kid would squawk about it.
 
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