Pacenti SL23 rim cracked

src1

Hi,

I build a set of Pacenti SL23 wheels earlier this year and checking the wheel over noticed the rim has cracked around 5 DS spoke holes to a greater or lesser degree.

Spoke tension was/is within specification, nipple washers were not used and rider weight is 80Kg.

Since these rims were bought, Pacenti have launched a new version with a thicker spoke bed to prevent the known problem of the rim cracking. They also issued advice that 24h rear rims should use nipple washers to prevent this problem. This rim is 28h.

The rims were bought from JustRidingAlong, should the rim (or both rims) be replaced under warranty?

Thanks,
Rob.

ugo.santalucia

[url=http://www.bikeradar.com/forums/viewtopic.php?p=19633502#p19633502]SRC1[/url] wrote:

Hi,

I build a set of Pacenti SL23 wheels earlier this year and checking the wheel over noticed the rim has cracked around 5 DS spoke holes to a greater or lesser degree.

Spoke tension was/is within specification, nipple washers were not used and rider weight is 80Kg.

Since these rims were bought, Pacenti have launched a new version with a thicker spoke bed to prevent the known problem of the rim cracking. They also issued advice that 24h rear rims should use nipple washers to prevent this problem. This rim is 28h.

The rims were bought from JustRidingAlong, should the rim (or both rims) be replaced under warranty?

Thanks,
Rob.

Just had the same problem on a 32 rear I built for a friend who bought it... JRA replaced it no problem with a new 2015 one. Just drop them an email with photos, they are really good people to deal with

src1

Thanks Ugo. I'll post back with how I get on.

mattythemod

I have posted before that the same thing happened 2 me on a rear DS with 6 spokes holes cracking ...JRA replaced it and rebuilt it without any issues .

mamil314

There's a post of Kirk Pacenti online saying that heavier riders should not be using rear wheel with a low amount of spokes, like 24. Good thing i did not know this back when i was 92kg and riding the 21 spoke Zondas..
I hope my 32/32 SL25 wheels will be fine, i was about to practice bunny hopping on them.

ugo.santalucia

[url=http://www.bikeradar.com/forums/viewtopic.php?p=19633919#p19633919]mamil314[/url] wrote:

There's a post of Kirk Pacenti online saying that heavier riders should not be using rear wheel with a low amount of spokes, like 24. Good thing i did not know this back when i was 92kg and riding the 21 spoke Zondas..
I hope my 32/32 SL25 wheels will be fine, i was about to practice bunny hopping on them.

The SL 25 is a different rim altogether... the problem was specific to the older SL 23. As things stand, spoke count is not the problem

src1

JRA have said the rim should be replaced under warranty, but obviously they need to see the rim first.

For anyone who wants to see the evidence:


This is the worst one, but 4 more have cracked too.

cycleclinic

I have built many 24H rears with the old version without nipple washers. None that I know of have failed. The rim seems to be very sensitive to spoke tension. I think the tension limit of 1200N is quite a hard limit on these rims. I don't think the issue is with the spoke count but I do advise the user of the 24H rim as part of a rear wheel should be 75kg or so. JRA will no doubt help you out.

I have had one 28H rim on the rear crack. Did the same as JRA and replace it. The new version of the rim is currently out of stock with the distributor (apart from 20H rims they have plenty of those). They had a small number of 20F/24R pairs but they are now gone (sorry). They have not yet had any 28H rims or 32H rims and the shipment is 6 weeks away on a slow boat from China.