Wheels for heavy rider. Need advice.

[twojs.bike]

I have been helping my neighbor with a bike issue and need some help.

He weighs 320 lbs and is having issues with his rear spokes coming loose.

Bike is a specialized hybrid.

For the past several months he has been riding daily. About 8 miles a day. Mostly pavement, but one section of gravel that is fairly bumpy.

He first came to me and his spokes were very loose and wheel was out of true and rubbing his rim brakes. This was already his second set of wheels. The LBS sold him a set they had in stock with 32 spokes. I was able to tighten the spokes and true the wheel.

It lasted about a week and the problem returned. Fixed the wheel and a week later his spokes were loose again.

I suggested he needed to upgrade the wheels. I did some research and came up with a set of touring wheels. Mavic A719 rims which get great reviews for heavier riders. Link to the wheels below.

I installed the new wheels and things were good for about a month. But today the problem returned.

It is just the rear wheel. Maybe a half dozen spokes were completely loose. I was able to tighten and true the wheels.

Not sure what else to try. I’ve read very mixed opinions on using Loctite. What about linseed oil, wheelsmith spoke prep, anti seize oil? What about spoke tension? Does a heavier rider require higher tension.

Any ideas?

Link to wheels below.

Wheel Shop Mavic A719 Black/ Shimano Deore FH-T610, Wheel, Rear, 700C

Road/Touring - 700C - Mavic A719 Black/Sapim Leader Black Rims: Mavic A719 700C (Black) ETRTO 662-19 External width: 24mm Inner width: 19mm Renown rim for Touring, one of the toughest and most enduring rim on the market Mavic's own proprietary Maxtal aluminum alloy SUP Tech smooth welded rim...

365cycles.com

 

[Indyjps]

Here's 2 700cc 36 hole rims, the Velo is double wall, not sure about the bontrager.

 

[Indyjps]

Bump up to 12g spokes. Would have to drill hub and rim, but 12g aren't going anywhere.

 

[twojs.bike]

Hmm. I considered 12g at first. The wheels we bought with the magic a719 rims get great reviews for heavy riders, tandems and touring bikes. Not sure I am comfortable drilling holes in the new hubs. If they were mine yes, but I hate risking other peoples money.

Checked in about a week ago and so far they have been holding up.

My next thought is a suspension seat post to cushion out some of the impact that might otherwise hit the spokes. Sound reasonable?

Also thinking about wheelsmith spoke prep. I didn’t build these wheels, so don’t know what was used. Typically I just use oil.

 

[deorman]

Have you looked inside the rims to make sure the nipples aren't pulling through?

 

[BDC]

When I was that weight (330) I had my wheels re-laced with 12g spokes - no issues. They only ever needed a mild tune.

Now that I've lost 100lbs upside is I can give it some air and big hits with real confidence.

*And* I can act all sanctimonious and point out that the wheels aren't really the problem

 

[Tallbikeman]

Grin Technologies sells 13/14 guage spokes cut to the proper length. These are best used on the rear wheel. I would check the rim to be sure metal deformation is not the problem. I use 36 hole Velocity Chukker rims in 700c. I have weighed to 286lbs with my present rear wheels with the 13/14 guage spokes only on the cassette side. No broken spokes and no spokes coming loose. 13 guage spokes fit in 14 guage hub flange holes with no modification. I will say if a rear wheel starts squeaking while being ridden then tightening the spokes is the first thing I do. 12 guage spokes will fix this problem but must be paired with an appropriately heavy duty rim. Putting thick spokes on a weaker rim begs spokes pulling through the metal and rim breakage. Being a Clyde myself I have lived with bicycle wheel issues for decades.