I have scratch like marks appearing under the coating on the front wheel alloy hub where the spokes are set. It is not bad but I have been told it is a condition called "worming" and is a manufacturing fault on 2007 Bonnie. A guy from my bike club said his had it on the same bike although a 2008 plated machine (otherwise identical) and his was being replaced under warranty. Mine is out of warranty so probably no luck there but I would like to know if this could be a cause for concern? Thanks for any advice Cheers

One of these may work. Measure distance through hub and diameter of hole, then call to confirm compatibility. A Schwinn dealer will be able to order but may cost more.
WheelMaster Alloy Rear Trike Wheel 24x1 75 Wei As7x Silver 36H

Northern Industrial Tools Tire Wheel 26in Spoked Pneumatic Spoked Wheels...

I’m happy to help further over the phone at https://www.6ya.com/expert/donald_f2ed37026a3ac881

More important than the bicycle model is the exact hub and rim models and specs.

At http://www.trekbikes.com/us/en/bikes/town/fitness/fx/7_1_fx#/us/en/model/details?url=us/en/bikes/town/fitness/fx/7_1_fx

I found this: "Alloy hubs; Bontrager 750 32-hole double-wall alloy rims"

which is STILL not specific enough to answer your question. Spokes come in measurements down to the millimeter and on the rear wheel the drive side differs from the non-drive side.

Measure them yourself or go online and look for a "spoke length calculator" then try to plug in the specifics of your wheels OR measure your spokes.

Or ask Trek...

http://www.trekbikes.com/faq/contact.php

Okay, it sounds like you mean the rim is cracked. STOP RIDING IT. Get the rim replaced at a bike shop or buy a whole new wheel. Depending on the wheel the cost may be about the same. If you get the same exact model new wheel you could keep the old one as a source for spare spokes and th hub is probably okay, too.

This is very unusual for the spokes to get loose on a wheel. Without seeing the wheel, I'm betting that the wheel has been relaced at some time or another with chrome or custom spokes. If they used the wrong spokes, they will not stay tight. Since the spokes came loose this time, they'll do it again. I've seen wheels laced like this before and the "knobs" on the hub end of the spoke does not lay in the holes like they should. You cannot keep the spokes tight nor the wheel trued. It's best to have it either relaced the proper way or simply replace the entire wheel.

Good Luck
Steve

the rear spokes are the same size( yes ).

To calculate spoke length you need several data points.

1) hub dimensions (flange, center to flange, axle length)
2) number of spokes
3) rim dimensions
4) cross/ lacing pattern of spokes.

For a good web resource to find spoke length and help with building the wheel try this.

You can also take into your local bike shop and they should be able to calculate for you as long as you have the information for the 4 factors above.

is it the actual alloy or a powder coating, if it is the alloy, replace them, they are no longer sound

what design are they, two thing could be doing it, if the obviouse touching has already been investigated, one is the design, if the spokes/hub sits out further than the rim than the outer of the rim they could be catching the wind and making some freaky noises, or if the center dishes in then maybe they are "loud" tyres by that i mean do the tyres have wide grooves, directional etc, high performance tyres are in principle very noisy. hope this has been handy.

If you do put on alloys you had better be gentle with them they will definitely bend or warp with very very little abuse as far as mpg i dont know but i would nt sugges taking it offroad to often with those on it,,

Hi have a nice day!
I think following article found to be interesting.
Most wheels on the market today feature a painted surface, machine lip or face with a clear finish. To take care of your alloy wheels without damaging the protective finish frequent washing with a quality car wash, such as McGuire's or Polyglaze, and water is highly recommended.
Periodic use of a bug and stain remover can prevent permanent damage, whilst waxing will protect the alloy wheel finish from the elements. NEVER use abrasive cleaners, steel wool, or polishing compounds. ALWAY's be wary of automatic car washes. SOME use acidic cleaners to remove dirt and grime. Others may use stiff brushes for cleaning alloy wheels and tyres. BOTH of these WILL HARM your Wheels So always ask about equipment and procedures before entering the car wash.
Never allow your alloy wheels or tyres to be STEAM cleaned. Hot steam can dull the paint or clear coat finish on your alloy wheels. NEVER clean HOT Wheels always wait until they cool down. Water on your alloy wheels will dry faster on a hot surface and cause your cleaning solution to dry to quickly leaving spots or a film of soap on your wheels.
Cleaning wheels in direct sunlight also causes the wheel to dry out to quickly, leaving spot's in the finish. This is a particular problem with chrome wheels, and machined faced alloy wheels. Clean your wheels on a regular basis, they are often the dirtiest part of your vehicle and they're constantly exposed to the elements, corrosive brake dust, ocean and sea salt plus the inevitable road tar.
Disc brake dust is a BIG problem. If not REMOVED it can actually burn small marks into the chrome or alloy wheels, which in turn if left untreated can lead to PITTING of your alloy or chrome wheels. Chrome plated wheels are particularly susceptible if left untreated SO please make sure care is taken. Clear coating on your machine lip of face alloy wheels can suffer a similar fate if left untreated.
If you do not clean Chrome Wheels or Alloy Wheels regularly moisture, which harboured in brake dust and grime, can lead to SEVERE pitting and rusting of chrome wheel surfaces.
TAKE "PROPER" care otherwise your warranty on your Alloy wheels or Chrome Wheels could be voided.