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Planetbike Fenders on '06 Specialized Sirrus

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Planetbike Fenders on '06 Specialized Sirrus

Old 11-13-05, 07:48 AM
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jnorcross
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Planetbike Fenders on '06 Specialized Sirrus

I realize that elements of this have been covered in the past, but after considerable searching, I still couldn't find the answer.

After hearing that some on this forum have had no problem installing Planetbike Road Fenders on their Sirrus, I went ahead and purchased them from Performance. Unfortunately, I just received the Touring/Hybrid (45mm) fenders instead of the Road (35 mm) fenders. Looking at Plantebike's website, I can't tell if there is any design differences other than width between these two fenders. So for now, I'm just assuming that I'll have the same problem if I order the Road fenders. I haven't decided if I'm going to put the Hybrid fenders on my wife's Trek 7300 or send them back and get the road fenders.

Overall, I had no problem getting the front one on, but the rear is the issue.

Here are the problems:
1) The hole drilled into the seatstay bridge is vertical, rather than horizontal, therefore, I can't bolt the fender on as described in the very limited instructions with the fenders. I can get around this one with zip ties.
2) There's a part of the front deraileur jutting back that interferes in the space where the fender should attach to the chainstay bridge - this seems to be a considerable problem.
3) Is it normal to have your rack (Blackburn) and the two fender stabilization bars mounted into the same eyelet on the drivetrain side on the bike - I can't see any other option without having to rig something up.
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Old 11-13-05, 02:01 PM
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I had the same problem with my SKS fenders. I tried to put the rear fender on myself, but just couldn't wing it. I took it to the bike shop, and he bent the little metal piece that attaches to the seatstay bridge 90 degrees so it would fit, then just attached the fender that way. The bulky deraileur wasn't too much of a problem, just bolted the fender on anyway. The rack and fender mounts are fine on the same eyelet.
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Old 11-13-05, 06:21 PM
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Thanks for the feedback.

Assuming, I can get them on with some tweek work or via my LBS, I'm also curious if there is any disadvantage to fitting the touring/hybrid 45mm fenders on this bike versus the 35mm road fenders since that would save me the trouble of shipping them back to performance and waiting for new fenders.

My bike is primarily for commuting, so if it's just an aerodynamic disadvantage due to the increased width, I'm not that concerned.
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Old 11-13-05, 09:59 PM
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Got them on. It took a little work, but with a little bending, the metal clip was able to attach at the chainstay and the part of the deraileur did not compress the fender at all.

As for the vertical hole on the seatstay versus the horizontal hole in the clamp on the fender - I used 2 zip ties to connect it to the seatstay instead. I'm not thrilled with how it looks, but it seems functional.

The rack and fender supports were easily bolted into the same eyelet. The bolt that comes with the Blackburn rack was significantly longer than the fender bolts, so I was in luck.
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Old 11-14-05, 04:43 AM
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At the eyelets, put the rack closest to the frame to reduce the leverage on the bolt when you are carrying a heavy load.
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Old 11-14-05, 07:57 AM
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Originally Posted by MichaelW
At the eyelets, put the rack closest to the frame to reduce the leverage on the bolt when you are carrying a heavy load.
I had read that from another post, but with the position of the fender mounts, I had to go fender mount - rack - fender mount. There was no other option.

New problem - riding to work today, after hitting a good bump, the clip part that attaches to the chainstay bridge fell off. This made for a loud ride the rest of the way as every time I hit a bump it rattled. I'll see if I can zip tie this down or mount it some way.
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Old 11-14-05, 08:55 AM
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If the wider fenders will fit between your brakes just fine - and they should, in your case - then stick with them. Tires can spray wide as well as in the exact plane of the bike. I've talked to some mechs who've commuted with narrow fenders and have had a dry line in the center of their back, but that their arms get hit with spray from the rear wheel. This isn't a problem if you use wider fenders. Not too much aero difference, I suspect.
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Old 11-14-05, 10:43 AM
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With SKS fenders, the chainstay bridge clip was a POS. I drilled a small hole through the fender, 1cm from the end and zip tied around the bridge. The mount has remained solid for several years daily use.

What is the deal with a vertical hole through the seatstay bridge of the Sirrus. Is it simply a mistake or are you meant to bolt the fender to the frame. My steel forks have a special threaded tab at the base of the steerer to bolt the fender directly to the fork without any mounting metalwork.
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Old 11-14-05, 11:10 AM
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I'm just going to assume the clip won't hold. There is already a hole in the fender. For now, I'm going to zip tie the fender through the hole in my chainstay bridge. If that doesn't hold (since I can only fit a very small zip tie through the hole), then I'm going to trim some of the clip off and see if I can bolt the fender to the chainstay bridge. In the world of biking, I can't see why a tension mounted clip makes much sense at all with all the bumps I end up hitting.

Honestly, I can't figure out why the Sirrus has the vertical hole. The fenders would have mounted fine to my wife's Trek 7300. I don't have any other bikes to try it on, but it does seem quite odd to me.
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Old 12-02-05, 02:19 AM
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Originally Posted by jnorcross
Got them on.
Any way you can post pics? I'm in the same situation, same bike, 35mm PB hardcore fenders. My plan, when I have a minute, is to drill a hole in the metal clip near the front of the fender, then put a bolt through it. That seems to be the only attachment point I'm having a problem with, and only because the front derailleur gets in the way of the clip. Tubus makes a rack that has an extra mount point so you can attach your fenders to the rack. Since I'm looking for a new rack anyway, thought I might splurge.
http://www.thetouringstore.com/TUBUS...RGO%20PAGE.htm (read "plese note" about fender mount)
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Old 12-02-05, 03:06 PM
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Originally Posted by jnorcross
Honestly, I can't figure out why the Sirrus has the vertical hole. The fenders would have mounted fine to my wife's Trek 7300. I don't have any other bikes to try it on, but it does seem quite odd to me.
Welcome to the world of bicycle non-standardization.

I've had to play MacGuyver several times to mount fenders and other equipment. My Coda is running two different fenders;an SKS front and Freddy rear. The Freddy front was too wide to fit between the fork legs,and the SKS rear stood off too far from the tire.

I had the Freddys on my '05 Sirrus Sport Disc. IIRC,I used the bolt that came with the kit to mount the clip to the chainstay bridge. I think there was a hole for the bolt;it's been awhile. If there isn't a hole in the bridge,you could try bending the clip down. I also used the zip ties for the top mount,and they worked just fine.
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Old 12-02-05, 07:55 PM
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Sure, I'll take some pics tomorrow and try to show all the attachment points.
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Old 12-09-05, 02:40 PM
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Here's a few pics of the fenders on the Sirrus including the use of zip ties at the chainstay and seatstay bridge.
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IMG_3885_6_3.JPG (83.9 KB, 78 views)
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IMG_3883_4_3.JPG (86.5 KB, 65 views)
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IMG_3882_3_3.JPG (85.1 KB, 49 views)
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Old 12-09-05, 02:44 PM
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Here's a pic of the whole bike with the fenders on it. It's not the clearest picture, but you can see basically how the fenders sit on the bike. These are the 45 mm hybrid fenders, so they are a little wider than the road (35mm) most people have used.
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