Tune Mag 170 & Mig 70 with Alpha 340 's
Moderator: robbosmans
Hi,
i am about to build a pair of wheels with Alpha 340 rims 28 rear and 24 front and Tune Mag 170 rear hub and Mig 70 front hub. I want to use 14mm prolock nipples and cx ray spokes.
I have two questions:-
1. Spoke length calculated is Rear 3 cross Drive 293, Non Drive 291. Front 2 cross 288.
Before i waste my time and money ordering the spokes does this seem right ?
2. If i use 14mm nipples should i reduce the spoke length ?
My logic says no don t reduce the spoke length ?
Thanks.
i am about to build a pair of wheels with Alpha 340 rims 28 rear and 24 front and Tune Mag 170 rear hub and Mig 70 front hub. I want to use 14mm prolock nipples and cx ray spokes.
I have two questions:-
1. Spoke length calculated is Rear 3 cross Drive 293, Non Drive 291. Front 2 cross 288.
Before i waste my time and money ordering the spokes does this seem right ?
2. If i use 14mm nipples should i reduce the spoke length ?
My logic says no don t reduce the spoke length ?
Thanks.
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nelson wrote:
My logic says no don t reduce the spoke length ?
Thanks.
Correct.
Decide beforehand if you plan to use nipple washers as per Stans recommendations before deciding on a final spoke length as they are around a mm thick.
Although, I think the new revision of the Alpha 340's (if that is what you are getting) may already have a beefed up spoke bed that doesn't warrant the use of the washers.
I built mine on the old version without and they have been fine, but originally intended to use them and found the spoke lengths were on the short side if I used the washers.
Something to take into consideration at least.
Although, I think the new revision of the Alpha 340's (if that is what you are getting) may already have a beefed up spoke bed that doesn't warrant the use of the washers.
I built mine on the old version without and they have been fine, but originally intended to use them and found the spoke lengths were on the short side if I used the washers.
Something to take into consideration at least.
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I just checked the spoke lengths and those look good. The 12mm nips should do just fine too.
Well the rule of thumb is divide the spoke count by 9 for maximum crossings. 9 goes into 28 3 times so 3 should be the maximum crossing. Otoh I once built a 36 hole wheel with a Dura-Ace 7800 hub and an open pro rim with 4 cross and I just barely ran into the spoke heads.I'm not sure if the flange diameter plays a role in that though? Fwiw Alchemy recommends 3cross for the drive side of 28 hole ORC hubs.
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You can go 3x on a 28H rear wheel but the hub flange has to be small enough. The left side flange is small enough for 3x I think but the right side is not. So it will be 2x for these hubs I think.
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3x on the rear shouldn't cause issues with crossing over the flange on this hub. As mentioned, if a hub had a massive flange, then 2x may be better even in a 28. With this hubset though, 28 hole 3x should be the ticket.
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Considering the same components but quick query on build. I weigh 76kg. Running a340's should I stick with 24/28 or can I drop to a 20 on the front (from reviews I think 24 on the rear will be too low for this rim for my weight). Also any views on spoke lace patterns, am I better with radial on the front?
Finally, if I go for a budget build, would I see much reduction in performance/durability etc using bhs super lights?
Finally, if I go for a budget build, would I see much reduction in performance/durability etc using bhs super lights?
Radial on the front is going to be much easier to lace up.
I laced up a radial front wheel of mine in about ten minutes.
I laced up a radial front wheel of mine in about ten minutes.
Beancouter wrote:Running a340's should I stick with 24/28 or can I drop to a 20 on the front (from reviews I think 24 on the rear will be too low for this rim for my weight).
I weigh a little more than you and have had no problem with the old 350g rim with 24 spokes in an Alchemy Orc hub, ~10k miles. The front is an 18h. The rims weigh ~390g now. 28r, 20f should be fine... but everybody is different.
The only issue with 3x lacing and 28h is if the flange is very large you will get an acute angle where the spoke enters the rim.
formerly rruff...
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