Pacenti rims

mattsccm

Any good?
I have heard some MTBers reckon they mark easily. I want them for the road though..
Experience's?

banditvic

Only just built some up ride really well but a pig to get tyres on SL23's, as I said only done a couple of hundred miles so not sure how they wear yet. On winter bike so it shouldn't take long to find out.

mattythemod

Had mine a year now and love em ....pretty stiff although i am a heavier rider and very strong , no issues with wear although they are on my best bike so minimal bad weather usage ...snug fit with GP4000 .

LegendLust

I've used a pair through the winter - they're very good but then again the guy who built them is very good

troj

I have a pair built up. Nothing flash 32/32 but I'm a big strong rider. Although they are built with Sapim laser all round. With 25mm Vittoria Corsa's latex tubes they come up nice, fat and comfortable. I have ridden all weathers, a number UK events and European sportives (including Paris Roubaix) no problems.

But.....they could look better. I have taken the stickers off. The pricing has changed a lot in just over a year. I paid just over the price of an open pro at the time. Now they are nearly £100. Me thinks some middle man is making some easy money. At that price if had to build a set of wheels I'd get HED or get another at a more reasonable price like a Velocity A23. What ever you choose don't scrimp on the spoke count on.

mattsccm

It helps that a pair from Planet x are 2p less than the credit I have with them. So in effect free. Going on Hope hubs

ugo.santalucia

The ones PX sell are 29 er though... not sure they will take road tyres

mattsccm

Width is fine. Is there anything else to consider?
psi?

mattsccm

I am old that tyre pressure is not an issue.

ugo.santalucia

If they fit fine, otherwise you will have to return them. Try the tyre before building the wheel

mattythemod

Well my pacenti rims 32 hole have just been replaced under warranty after developing multiple cracks around the eyelets on the rear rim driveside , theres some reports stateside of this happening on 28/24 rims but not on 32 rims , its also been claimed that there was issues with some batches and that is a design issue with there not being enough material around the eyelets on the rims and high tensions placing to much stress causing cracks .

ugo.santalucia

mattythemod wrote:

Well my pacenti rims 32 hole have just been replaced under warranty after developing multiple cracks around the eyelets on the rear rim driveside , theres some reports stateside of this happening on 28/24 rims but not on 32 rims , its also been claimed that there was issues with some batches and that is a design issue with there not being enough material around the eyelets on the rims and high tensions placing to much stress causing cracks .

The thing is, there are no miracle rims... if a rim is too thin, it will crack and if it's too light, it means it's too thin. I don't believe in the QC issues in some batches... it's a damn strip of metal that is continuously extruded, bent, joined and drilled. The only process which might have QC issues is the joining, but you hardly ever hear of rims opening up at the joint. If a rim cracks, it means all rims are prone to cracking and under the right conditions they all will.

on-yer-bike

Yep, think curtain rail made into a circle. Keep clear of placenta rims then, must be made too thin.

cycleclinic

Don't stay clear of them. What you don't know in these claims is what spoke tension is run. Some builders think more tension means a stiffer wheel and put 1400N on the DS rear this is too much and it will crack. 1200N is a tension the rim can handle. They are good rims and are as light as they can be if they are going to be reliable.

The wheelbuilder I suspect is responsible for the failure which makes me hope all the ones I have done don't crack!!!

mattythemod

thecycleclinic wrote:

Don't stay clear of them. What you don't know in these claims is what spoke tension is run. Some builders think more tension means a stiffer wheel and put 1400N on the DS rear this is too much and it will crack. 1200N is a tension the rim can handle. They are good rims and are as light as they can be if they are going to be reliable.

The wheelbuilder I suspect is responsible for the failure which makes me hope all the ones I have done don't crack!!!

Well i hope it was Spoke Tension that caused it , surprises me a liitle as the wheelbuilder is quite high profile and is a dist for some brands , i hope a one off mistake / issue .

cycleclinic

I didn't say it was spoke tension but it may have been the cause of the failure. Some Easton wheels have incrediably high tension, same with Bontrager I suppose they are trying to stop NDS rear spokes from unwinding but it can result in rims cracking had to deal with a few of those and they were not light rims.

Your wheelbuilder may have done everything right and it still cracked. The Pacenti rim may be one of those rims that is very sensitive to even a slight over tension like the DT Swiss RR415. On the latter rim 1100N is fine but 1200N is not. I am personally sticking to 1200N max but on the wheels I am about to do for myself with a 2:1 lacing pattern the rear will be tensioned to DS 1100N and no more as this build won't need more and the NDS tension will be 80% of the DS.

ugo.santalucia

I once measured a rear Archetype built by JRA at 1600 N.... now, that was tense... :shock:

cycleclinic

That is way too much for any rim and beyond what is needed, madness!

mattsccm

Just as an update .They have built up very nicely with some Hope hubs. Running Michelin 25mm Pro 4 SC tyres which come up at 26.1mm. Have also used them with 30mm Challenge Strada Bianca's which come out as 31.6mm.

cycleclinic

Actually ugo was the spoke a CX-ray because if it was the DT Swiss tensio that you have gives a figure that would indicate a higher tension than is actually present. I have a claibration jig and the CX-ray at 1200N gives a reading of 0.65 from memory on the tensio not 0.5 like the chart suggest for the aerolite. Still 0.79 which is 1600N for a CX-ray is still high but not 1600N.

Good news about your wheels Mattscm. I want to try those challange strada tyres. Tried a 25mm conti GP4000S on them today and that tyre came up at 27.3mm on the SL23 up from 25.2mm on the CXP22 rims the customer had before. Result all round.

ugo.santalucia

No, sapim race

cycleclinic

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