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Home > Forum > Triathlon Forum > Tire question for an old Trek speed concept

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Tire question for an old Trek speed concept
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gradiology
Jul 2, 23 16:08
Post #1 of 13 (931 views)
I've got a 2011 Trek speed concept with bontrager aeolus wheels that are 65 mm deep and 21 mm wide. Based on the 105% rule I should only be racing with 20 mm tires. But that goes against a lot of the newer data on wider tires and rims. However, the clearance on these bikes isn't very good and I can't fit my zipp 808s on the bike.

Any advice on what my options are would be much appreciated. Thanks in advance!
Last edited by: gradiology: Jul 2, 23 16:08
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Re: Tire question for an old Trek speed concept [gradiology] [ In reply to ]
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stevej
Jul 2, 23 16:27
Post #2 of 13 (913 views)
808 firecrests? Why can’t you fit them?
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Re: Tire question for an old Trek speed concept [stevej] [ In reply to ]
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gradiology
Jul 2, 23 16:33
Post #3 of 13 (912 views)
There's not enough clearance on that bike.
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Re: Tire question for an old Trek speed concept [gradiology] [ In reply to ]
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stevej
Jul 2, 23 16:38
Post #4 of 13 (908 views)
Yes there is. I ran 808 firecrests (and a super 9) on that bike for years. You might need to adjust the brakes to get additional clearance. The front is relatively easy. The back requires a little more finesse.
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Re: Tire question for an old Trek speed concept [stevej] [ In reply to ]
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gradiology
Jul 2, 23 17:23
Post #5 of 13 (884 views)
Thanks. I'll bring it into my LBS and have my mechanic who is the best in the area see if he can work his magic.
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Re: Tire question for an old Trek speed concept [gradiology] [ In reply to ]
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jimatbeyond
Jul 2, 23 17:34
Post #6 of 13 (873 views)
You can adjust the brakes.
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Re: Tire question for an old Trek speed concept [stevej] [ In reply to ]
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xeon
Jul 3, 23 9:36
Post #7 of 13 (779 views)
Same, I ran the 404/808 FCs on my first gen SC no problem. I ran a 24mm on the rear with the Conti Force/Attack tires.
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Re: Tire question for an old Trek speed concept [gradiology] [ In reply to ]
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SummitAK
Jul 3, 23 11:09
Post #8 of 13 (757 views)
gradiology wrote:
Thanks. I'll bring it into my LBS and have my mechanic who is the best in the area see if he can work his magic.

FYI, the finesse Steve mentions above for the rear brake is that spacing is adjusted by moving washer spacers from behind the pad holder to the outside of the caliper (to open it up and reverse for reducing width). It is quick and easy, but can be challenging without an extra set of hands.
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Re: Tire question for an old Trek speed concept [SummitAK] [ In reply to ]
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TH3_FRB
Jul 3, 23 11:36
Post #9 of 13 (750 views)
A set of the Bontrager Race XXX Lite brake levers with the adjustment dial built in works great. Once set up I could swap in my Super 9 and 808 NSW race wheels for 404 training wheels without needing to screw with the washers.


SummitAK wrote:
gradiology wrote:
Thanks. I'll bring it into my LBS and have my mechanic who is the best in the area see if he can work his magic.


FYI, the finesse Steve mentions above for the rear brake is that spacing is adjusted by moving washer spacers from behind the pad holder to the outside of the caliper (to open it up and reverse for reducing width). It is quick and easy, but can be challenging without an extra set of hands.
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Re: Tire question for an old Trek speed concept [TH3_FRB] [ In reply to ]
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SummitAK
Jul 3, 23 11:47
Post #10 of 13 (748 views)
TH3_FRB wrote:
A set of the Bontrager Race XXX Lite brake levers with the adjustment dial built in works great. Once set up I could swap in my Super 9 and 808 NSW race wheels for 404 training wheels without needing to screw with the washers.


SummitAK wrote:

FYI, the finesse Steve mentions above for the rear brake is that spacing is adjusted by moving washer spacers from behind the pad holder to the outside of the caliper (to open it up and reverse for reducing width). It is quick and easy, but can be challenging without an extra set of hands.

Those were handy. I had them too. Then lost them when I installed Di2 shifters:(
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Re: Tire question for an old Trek speed concept [SummitAK] [ In reply to ]
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gradiology
Jul 3, 23 11:52
Post #11 of 13 (741 views)
Thanks for all the helpful information. You guys are awesome!
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Re: Tire question for an old Trek speed concept [gradiology] [ In reply to ]
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gradiology
Jul 3, 23 16:33
Post #12 of 13 (693 views)
Question for all the aerodynamic specialists. Is an 808 too deep for a front wheel? I have the bontrager aeolus 65 mm on there now but it's only a 21 mm.
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Re: Tire question for an old Trek speed concept [gradiology] [ In reply to ]
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gradiology
Jul 3, 23 16:59
Post #13 of 13 (685 views)
I don't know the exact weights for comparison. But just holding them in my hands. The zip 808 is definitely a little heavier too.
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