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z7 - lowest draw weight for 60=70# limbs

16K views 10 replies 6 participants last post by  rally  
#1 ·
What is the safest minimum that a 60-70# set of limbs can be adjusted down to ?

I recently bought a Z7 with 60-70# limbs
Being a new archer I actually wanted a bow with 50-60# or 55-65# but couldnt get what I wanted.

I wound down the adjustment when I got the bow by one turn, but then realised I didnt know the starting weight !
So I asked the previous owner (Matthews sponsored) who said it was at 62#, and when I got to measure it I found that I had wound it back to about 57#

Since that is below the rated minimum, I just wondered how low can you go.

A buddy drew it and said it felt a little stiff to him

Thanks

Rally
 
#3 ·
First you either have 50, 60, or 70lb limbs. There is no true in between. Also, Mathews is 4 turns out from fully turned in is the safest lowest weight for the limbs. If you want it turned fully up max it out all the way in and back it out at least a 1/4 turn on each limb. It's not good for the bow to shoot all the way cranked down. And third thing is I highly suggest using a bow scale and or have a pro shop do it. If the limbs aren't tightened up the same you will lose your timing and cause erratic arrow flight. Also the bow is made to preform the best at the limbs full weight. I have a 60lb z7 and it is a tack driver set dead at 60. Hope this helps you out.

2013 Monster Chill black 27/70
Mathews QAD
Axion black 5 pin
Mathews t5
Easton flatline 400
2010 Mathews z7 lost camo 27/60
QAD HD
Axion lost camo 5 pin
Mathews t5
Easton n-fused 300
 
#4 ·
Thanks Guys,

I'll tighten them all the way up and start winding out again and see how many turns I get
My technique at this point is unlikely to be limited by the bow !
But I hadnt really considered cam timing, so thanks for that.

I was just hoping to wind it down as low as possible.
My buddy has a set of digital bow scales and we used them to verify my 56-57#

A set of 50-60# limbs were quoted at being between $300 to $400 and were a special order over here - so that made it too expensive to consider !
So it actually ends up being cheaper to buy another bow (Heli-M or Z7 Extreme) which my 11yo son will grow into soon anyway than waste money on a set of limbs (at that price)

I thought Matthews offered some 55-65# limbs on some of their short ATA series bows, but maybe not.

I will exercise into the 70# limbs but I have damaged my left arm a little, so its been a case of trying to nurse that through the muscle training phase

Cheers

Rally
 
#6 ·
You're right there !
But that is what i was quoted by a Mathews dealer on the phone - we dont even have a dealer in my home state.

I am guessing that is what happens when you have Distribution rights into a region of an imported product and limited stocks in a small market
International freight to Oz and then domestic freight to me.
So everything is a special order that has to be imported and freighted on its own rather than in bulk and next to no competition to keep pricing competitive !

I can understand it - if volumes are low then it makes no sense to carry all the spare parts, but it doesnt make it any better for the end user.
But limbs !- I would have thought that ought to be an essential.
 
#8 ·
Interesting point

I wonder at what draw weight a given cam is designed to be its correct design draw length - limbs at their lowest, in the middle or at full and by how much ?
Something I guess I could measure myself with 10 minutes work.

It doesn't seem to be a problem for me, but with a left grip arm that keeps buckling up without notice, I probably need to do something before i damage something anatomical !